DIY Laptops Repairs Codes And Abbreevations

How do you test a transistor using cathode ray oscilloscope?

It's possible to test the transistor using Cathode Ray Oscilloscope (CRO)

CRO provides a function called "Component Testing". Just connect the transistor terminals between two pins provided by this function and you can observe the patterns on the CRO screen. Normally, in case of transistor, The operation is divided in few parts.

01. Observe the pattern for CB configuration.

---- For this, connect the terminals from CRO between this Collector and Base terminals and you can observe the pattern shown by CRO.

Same procedure should continue for CE & BE configuration so as to test the transistor.

LAPTOP MOTHERBOARD POWER ON DETAIL

V2000/m200/dv1000 power on steps detail signals with diagram and step explanation

3VPCU, 5VPCU , +5V, +3V 5VSUS, 3V SUS, NBSWON#, DNBSWON# SUSC# SUSB#, SUSON, MAINON, VRON S5_ON, HWPG, POWERGOOD, VCCP, VCORE SMDDR_VTERM, PWROK, RSMRST, PCIRST,CPUINIT,CPUPG, IMVPOK, CLK_EN# CPURST,

HP, CQ40 series power on boot process signals and chip detail

AD-OFF DCBATOUT TO_SYS. ACAVIN PWR_S5_EN 5V-PWR 3DE-PWR PWR-S5-EN 5V-PWR 3D3-PWR +3 VALW, +5 VALW +3 VALW, +5 VALW +3 VALW RSMRST-SB #BT-TH # PWR_BTN PWBTN-SB PM-SLP-S3 # PM_SLP-S4 ALL-PWRGD VR ON PM-PWPOK CPU PG PLT-RST

Dell laptop d600 boot process main signals detail

+ RTC_PWR5V & + RTC_PWR3_3V, + RTCSRC, (PWR_SRC) DCIN +, + DC_IN, SDC_IN +, ACAV_IN (+5 VALW & +3 VALW) LIVE_ON_BATT . power good VCC1_PWROK

+5 VSUS & +3 VSUS +2 _5VSUS & +1 _5VSUS PWRSW_SIO # SUS_ON +3 VSRC SUSPWROK_5V RUN_ON +5 VRUN, +3 VRUN, +1 _8VRUN, +1 _5V RUN, M7_MEM, M7_CORE, M7_1.8V SMDDR_VTERM 1.25V RUNPWROK CPU VTT VCC1_2_MCH RESET_OUT # VCORE_PWRGOOD, 1715PWROK, IMVP_PWRGD CPUPWRGD SLP_S1 # IMVP_PWRGD VTT_PWRGD # DELAY_IMVP_PWRGD

IBM T40 POWER BOOT DETAIL SIGNALS

VREGIN16, VINT16 VCC3SW , VCC5M , VCC3M , VCC1R2M VCC1R8M, MPWRGD, VCC3B, VCCCPUCORE for CPU, VBAT, DC –IN, VCC5B, VCC3A, VCC3B, VCC3P, VCC1R8A, VCC1R8B, VCC1R2A, VCC1R2B, VCC2R5A, VCCVIDEOCORE, VCCCPUIO, VCCCPUCORE

Component Level Motherboard Repair (Not replacement)

1) How do you diagnose the exact component failure?

Obviously, a burn mark is a dead give away, but what if there are no visual signs? Do you poke around with a multi-meter? With what voltage settings and how do you know what to look for?

2) Is it usually a bad capacitor?

badcaps seems to think so. What about a bad connection?

3) How do you perform the component level repair?

So you've found the bad capacitor or component, can you really solder a new one on without hurting the components around them? What's a good soldering iron for under $100?

Answers to your questions

Diagnose problem:

We also measure all sort of signals, such as PCIRST, CPURST, CLK. We measure the resistances of each AD line from north bridge to CPU/RAM.

We watch the current changing patterns to get rough idea where is the problem.

There are some simple steps to follow when checking a notbook motherboard:

1. make sure main system powers are ready, that is 3V and 5V.

2. switching circuit is ok, which involes IO/Keyboard controler, south bridge

3. power sequence is ok, which you can see the current jump up and down for few times.

4. all the necessary signals are not missing.

About Bad Cap

It happens but only about 10% in those motherboards need to repair, and it is the easiest fault to repair not matter if the cap was burnt or not.

Loose connection

Mostly happen on VGA chips, south birdges and the places close to CPU. Hard to troubleshoot and need lot experiences.

How to repair?

You need specialised tools. I have DC power supply which can display current change and set to different voltage and current output. You need Really nice soldering station, SMD rework station, BGA rework station, etc. I also have more than thousand schematic diagrams, all together about 10GB and you could not find anywhere in the net.

I have seen the video in youTub teach people how to fix VGA problem, and I guess you only have 30% chance if you follow it. My BGA rework station tutorial can perform up to 95% successful rate.

Troubleshooting Dead HP G6000 Motherboard

Things that are likely worth solving:

Bad capacitors. Decently common and the parts only cost a few cents.

Most of the ICs on board... 4-20 pin jobbies such as the power ic do fail and are swappable for less than a buck or so

Blown fuses. Easy to diagnose easy to replace. This is a definite.

Any and all damaged jacks. Power and audio being the most commonly broken.

Resistors. easy to find easy to replace. cost is in pennies

Transistors and diodes can be more problematic to diagnose and fix but they too are cheap and swappable with just a soldering iron.

Obviously you can swap cpus so you should be able to diagnose that as well.

Case Study 1

"Machine: HP G6000(same mainboard as V6000)

Problem: Laptop will not power up, completely dead

Description: The machine has been water damaged. It does not have system standby power, which are 3V and 5V.

Finding The Fault:

Check Max8724(the battery charging chip) first, because to make system has standby power this chip must work correctly. This is a 28 pin chip, we only need to test 1, 2, 4, 8, 10, 11 pin. They are VIN(main power for chip), LDO(provide 3.3V for chip itself in order to set REF voltage, also provide signal to drive 2 MOS to charge battery), REF(set reference voltage of the chip), SHDN#(enable/disable chip, a switch), ACIN(indicate the power supply has plugged in), ACOK#(power adaptor ok with mainboard).

Everything ok except 10 pin, ACIN is 0V. This is incorrect, mainboard doesn’t detect there is an adaptor! Trace it backward and find it is very simple – mainboard use 2 resistors to pull the input voltage(19V, directly from dc socket) down to about 4V, so test the first resistor and find it opened. Change it and 3V/5V power come up and mainboard be able to switch on.

Then the trouble start when I try to charge the battery. The charging current never go beyond 0.15A and after 10 seconds the charging light start to flashing. Also can’t switch on from battery. First, change Max8724, still same problem. Next check all the resistors around max8724 and change it if it has any sign of watering, still no good. Then change KB3926(EC/KBC, chip monitors the statue of battery), still same.

Decide to check MBDATA and MBCLCK, 2 signals that send battery information from battery to KB3926 before I give up. I find the MBDATA is short!

Finally, find there are 2 pins stick together on CN10(the connector of multimedia switch board). Fix it and it start to charging battery. Switch on with power adaptor, ok. Remove the power adaptor once switch on, battery keep the mainboard running, ok. But still can’t switch on from battery once remove the power adaptor. Think, think, do I miss something here or there? Oh, the CMOS battery not installed, put the CMOS battery back and everything work perfectly. The battery part of troubleshooting takes me about 3 hours.

Remember, system may not run if you don’t have CMOS battery or CMOS battery is low for some AMD cpu mainboard.

Case Study 2

"Machine: Acer 4600

Problem: Laptop will not power up

Discription: The machine wont turn on when customer bring in.

1. plug in our power supply and it shows short circuit on board, the current jump to the 5A, which is the limit of my power supply.

2. take off the mobo, drop the voltge of power supply to 5v, limit current to about 1A, plug in again and find a mos very hot.

3. replace this mos, now the short circuit fixed.

4. turn on, the current goes up to 0.3A and stopped, it should go up to 1A during booting.

5. touch cpu, not hot, no power to cpu.

6. check the cpu pwm, which is max1907a. all conditions to make it work are present, but still no power output. the ref voltege is 0. so most likely this chip gone.

7. I replace the chip and everything work fine.

For lots of unknow brand laptops, sometimes very hard to find drivers. I don't know how many people know there is a trick to install a similar driver.

Machine: TPG (can't see the model clearly)

Could not find the driver, TPG web site only point to Asus web site and doesn't give which model it clone from Asus. We can't find vga driver.

We use Everest to check what vga chip it use and find it is ATI IGP 320M U1. Download few from different web sites, all of them just give a message said could not find hardware it supports.

Finally, download a driver from fujitsu web site for the lifebook S2020(same vga chip and south bridge chip as TPG's). But still give the error message said no support hardware find.

Every device has a Device Instance ID, and windows will compare this ID with driver's INF. It will install the driver if it find a match ID and match SubSys, otherwise will give an error message.

We check the driver for S2020, find the string "PCI\VEN_1002&DEV_4336&SUBSYS_118110CF" in one of the INF file. We also find the Device ID on our machine is "PCI\VEN_1002&DEV_4336&SUBSYS_2029161F&REV_00". Device ID is matched but just into different sub system. Replace the string in S2020's INF with our Device ID string, driver is installed correctly and no error message.

Dell inspiron 6400 with a power problem.

Laptop can't run nor charge the battery on adapter, but on battery it's run.

This is typical protection circuit problem. check the 2 mosfet just after power socket

Charging problem

C700's charging chip is 39A126, DV6000/9000's charging chip is max8724 or max8725. Check the working conditions of those chips. such as VIN, ACIN, ACOK, LDO, REF, SHDN.

Charging problem is second hardest problem on notebook repairing, the first one is signal level – everything looks ok but just no display.

usb no power

The following solution only apply that usb no power, if the usb device get power but can't be detected or can't be recognised by system, that indicates south bridge problem.

To get power for usb is very simple. use multimeter to find out which usb pin is ground, the pin on the other side will be the power. for example say pin 4 is ground so pin 1 will be the power.

connect power pin to 5v you can find on motherboard, usually a big inductor(becareful, when you measure the voltage, put battery in as well, some mobo the inductor for charging circut give you 5v if you don't put battery in but jump to battery voltage once you put in the battery, such high voltage will burn your usb devices). connect it on the different side of inductor that mosfet connect to(or should I say power out side?) so you can get smooth waveform, don't connect to the same side of mosfet(this is power in side).

Dark image on the screen , just very hard to see, a torch will show it is there though).

When we fix such problem, usually we do the following:

1. find an known good lamp or screen, plug into inverter see if its light up. if it lights up so you need to change your screen's lump.

2. if it not light up, do following:

a. check power(either 5V or 19V), enable signal(3V), brightness control(3V) are presented. (all testing by done with adaptor plug in).

b. if all those presented, then change inverter otherwise

c. need to find out which wire is power, which is enable, which is brightness people find hard in here because they don't know how to find out which is which.

Power always connect to fuse (also need to check fuse is ok). for the other two, you need to check inverter pwm's datasheet to make decision. Just start from pwm's EN and Brightness pin, trace back to connector. After you find out, make sure all these wires has normal resistance to ground, otherwise you have to cut off the wire that abnormal. Then try to find exact voltage from mobo and connect to inverter, by doing this you are not really fix the problem but bypass it. It is a easy to work around it rather than fix problem.

Q. The first step to troubleshooting is monitor the current change. usually, current reading can tell what was wrong and quite accurate. You frequently mention monitoring the current change to pinpoint the area of failure. Can you please describe this troubleshooting technique in more detail with some guidelines and numbers to look for?

A. To understand why current changing, you may need to know the basic powering states of notebook – which is called ACPI standard – S0 to S5.

S0 is full runing state, S5 is state that after you swith off laptop but with either power or battery presented. out off topic here, the S5 is the state after you shut down computer not the state you just plug in the power. Power button is for wake up computer from S5 and enter into S3. In ACPI standard, to switch on computers you need a signal "RSMRST". It explains why some laptops auto switch on if there is no CMOS battery, because its EC send RSMRST when power plug in. But you need push power button to switch on laptop if there is CMOS battery, because laptop remembers it is in S5 state.

Powering up a laptop can be divided into few parts, first check south bridge's gpio defination, check communcation between bios and south bridge, check system ram, power cpu, power up vga. so you can see the current goes up and down. step by step it reaches to full power.

Current changing monitor is just give you rough idea, sometimes not so accurate. let's see 2 examples:

1. a hp 530, power up but stay on 0.68A. it should go down a bit after 0.68A, and up again. The faulty mobo current change is 0.02 – 0.3 -0.68. After we see this current, we know it may have problem on SB or may be on NB but most likely is SB.

I check LPC 0 to LPC 3, no signal find. it may have problem on SB or BIOS. So I flash the BIOS before I do anything on SB. It was fixed after I reflash BIOS.

2. DV9000. Normal mobo: 0.01 – 0.3 -0.9 – 1.1 – 0.9 – 1.2 -1.45 then display. we find faulty mobo 0.01-0.3-0.9-1.1-0.9, by checking DMI Link we find there is one or two pulses. So we have an idea that it already pass memory checking, the next stage is VGA checking and active VGA output. In here, if it stop in 1.1 it most likely NB or SB problem, but if it stop in 0.9 or after, it may be the problem of VGA.

Current changing gives you an idea about where is the fault but not 100% accurate. People ask me what fault by just give me the current reading and I always say you need to give me the changing states, how many jumps that current made.

Machine will run on charger with battery removed instal the battery and it will only run on the battery not the charger

Looks like discharging has problem. When discharging mosfet has problem, or the Gate voltage not correct, the 18V of main power will directly go to battery.

The current will be very large when you have short discharging mosfet, if you plug charger in and have battery installed at same time. Laptop will detect this abnormal current and refuse to start up. Remove either one, machine can start up.

How to diagnose motherboards on a component level. What tools needed?

I find it is very hard to explain this. actually, it is very simple and can be described in two words: current and singal. read the current change during booting tells you where the machine stopped. check the singals on the different part of motherboard tells what is wrong or what is missing.

Tools are: smd rework station, bga rework station, power supply has current meter. all the rest tools you can find in any radio tv repair shop, of course all the datasheets for the components, especially the schematic diagram, you will find it much difficult without it.

What are common faults on mainboards? Do certain components fail?

Is there a trend as to which parts fail quite often?

Different maker/model has different common fault. Toshiba S1 is vga chip, and can't be repaired(well, almost can't be repaired because the pcb quality is not very good so successful rate is very low).

HP DV2000, 6000, 9000, compaq v3000, v6000, dell 1210, all those use nvidia chips have problem on vga chip or north bridge. easy to repair but have to make fan keep spinning after repaired, otherwise will break down in 1 or 2 week again.

hp nx5000, cpu pwm chip dry joint. acer 290, cpu pwm dry joint. hp dv1000, compaq m2000 protection circuit easy to blow up. ibm t40 vga dry joint problem.

These are just few of them. every machine has its own common fault. but dry joint is the common problem for all machines.

How to replace the graphics card on a dell 1420, the gfx card is a nvidia 8400gs

To fix such machine, first you have to do bga reworking on the chip, then connect fan to usb power to make it spin faster and non stop. also need to cut off fan controling wire.

could short on PQ8 make gate voltage high on both mosfets?

what do i need to check to find out why voltage is 19.36v.at gate

i have tested PQ8 and PQ9.results are as follows. PQ8 is AO4407. pin 1,2,3 is 19.37v. pin 5,6,7,8 is 19.36v. pin 4 gate is 19.37v.

PQ9 is AO4407. pin 1,2,3 is 19.37v. pin 5,6,7,8 is 11-12.00v. pin 4 is 19.37v.

i have set meter on diode mode and put positive on pin 2-3 and negative on 6-7 the meter beeps and shows resistance of 0.6 ohms,then i reversed the positive – negative ,meter beeps again shows resistance of 0.6.it beeps both ways. this is PQ8.

i have done same as above with PQ9 and it shows resistance of 25kohm both ways.

Solution GATE PQ8 PQ9 Should be coneccted in the same line (trace) , if PQ8 is burn please check also PQ19 , another ao4407 are conected in the same DRAIN SOURCE , you need to remove from mobo and test in continuity or 200 Ohms scale , if you see 0 – 10 Ohms betwen drain source is burn sure , check then PQ19 . You need 19v at PQ9 pin 5,6,7,8 but if PQ8 is burn not work . PU4 ISL6251 is the charger IC.

Toshiba sattelite P200-1JV laptop.it runs on battery without any problem.

it does not run with a/c. does not charge battery.

Solution first check all mobo marks to found mobo model and if you can found the schematic , then you need to found one mosfet 8 pin sop8 that is conected directly to DC JACK , and then found the next mosfet conected with the first mosfet , when you conect AC you need this 2 mosfet open , 19volts at DRAIN SOURCE , and about 8-10volts at GATE to open , usually is controled by the IC charger circuit , maybe have a short in AC circuit side or IC charger not recognize the adaptar and no open mosfets .

Having problems whit dell xps M1530

Dont do nothing when press power button , ACAV_IN is present at Q5 Q6 (3.2V) i have DCBATOUT but 3v and 5v not present , i check DCBATOUT for U69 TPS51120 and is OK , then check VREG3 VREG5 and also work fine , but i dont have 3V/5V_EN to activate outputs , Q17 is not in mobo only pads , D16 have 0.06v at 3V/5V_EN and 3.3v at PURE_HW_SHUTDOWN# , maybe need S5_ENABLE to activate 3v and 5v ? what you think about the next step to check ? maybe some signals in KBC WPC8763L .

Solution At the moment the TPS51120 is working , use power supply to put 2.5V in D16 3V/5V_EN and the 3V 5V outputs go enable . find why S5_ENABLE and 3V/5V_EN are low .

My D505 may power on boot OK or may have following condition.

a)LED flash

b)"da.da.da....." sound.

Solution If you know the bios manufacturer, the beep code will tell you where the failure is.

So the number of beeps and the duration of each beep is a specific code from the bios to let you know what it couldn't start – like video, memory, cpu etc.

The north bridge dry joint, it is common fault of this model. BGA reworking on north bridge, and replace the north bridge if bga reworking doesn't work.

It's a Toshiba Satellite A205-SP4077, Core 2 Duo. While replacing cracked LCD tried several panels with no success.

Then noticed LVDS RX2- signal from motherboard is missing.

Solution The north bridge dry joint, it is common fault of this model. BGA reworking on north bridge, and replace the north bridge if bga reworking doesn't work.

A friend has an Acer, one of the alphabetic keytops has come off. It doesn't appear to be broken, but I'm having trouble clipping it back on. It's a weird double hinge, something like a Thinkpad, which I've fixed before (easily). Any insight into mechanical aspects of keyboards?

Solution First, put the retainer(or what you said "hinge") onto the keyboard base, then put the key on the top, slightly press down and lock the key on the retainer.

I currently have a HP DV6000 sitting in front of me with several rows of black/grey lines over the screen. Is it worth trying to fix yourself or should I just send it in for a warranty repair

Solution Send for warranty if it is still in warranty. To complete solve this problem, you need to replace Nvidia chip which was made after 30th week of 08.

A friend opened up his notebook to give it a clean but when he put it back together the bios is not finding the hard drive Solution Make sure you plug hard disk firmly.

It could be the problem of south bridge, the south bridge controls hdd. I have seen many times that clean cpu fan and end up with non working laptop.

I have a problem with a toshiba tecra M9 I bought the notebook on ebay. The seller said it was dropped, worked for a few days and then died.

Solution The common problem of this model is vga chip dry joint. check the hdd light flashing or not, it should be the vga if it flashes.

Note: The hardest repair laptop is dropped one, even harder than watering. The south bridge, north bridge and vga chip all could be dry joint. To fix such machine, I always resolder those big chips, sometimes it works and sometimes it is not. There is no good way to fix such machines, just simply take the chance.

Laptop has crashed and when you boot, the screen is split so there are 2 identicle screens vertically (1 above the other). It wont boot normally or last good config but will boot safely with networking but if it boots like this, wouldnt that suggest a hardware/bios issue.

Do you think if I heat up the VGA chip (or SB or NB) then the solder will melt and get fixed?

If so, what should I use to heat it up?

Solution I am not suggest you do that unless you have bga rework station. The temperature control must be very strickly. But if you want to take the chance, I suggest you use 2 hot air guns, one from top, one from buttom. Set the top temperature to 350, set the buttom to 300 and blow it about 10 min.

In the case you want to go ahead with such project. you must firmly fix both air guns and motherboard, not let them move when you blow the hot air. Use a little stick to touch the capacitors or resistors around the big chips, keep blowing about 5 min when the solder on small components reflowed. Don't forget to apply flux between big chips and pcb board. don't set buttom temperature too high, otherwise the components on the buttom may fall off. Good luck.

To be honest with you, I have less than 10% successful rate for dropped machines even I have a bga rework station. The watering boards I have more than 70% successful rate.

I have an issues with my girlfriend's old Acer Travelmate 3260 (bought 2007), the power input pin has broken and it no longer gets any power to the system. This gradually happened over time with it getting looser and not charging properly.

Do you have the schematic for this model and also do you have instruction on how to replace the power socket, plus where to buy the component from?

Solution You don't really need schematic for such repair job. The DC jack you can find on ebay, I think someone in uk sell all type of jack. you also can attach a cable if you couldn't find such jack, and such connector can be easily found in online.

Dual screen problems

Solution First, I don't think it is a good idea to use dual screens on laptop, you put extra loading onto the vga chip.

Second, the external monitor flicking means vga card try to setup the display mode and resolution on the monitor. It will be stable once it set the display mode and resolution.

Vga overheating

Solution There is overload to vga chip.

I still remember that back about 3 years ago I saw people modified their IBM Thinkpad, they use QXGA(resolution is 2048x1536) to replace original sxga(1400x900). The result of doing this is vga chip get overheat and kill machine fast, usually not over one year. But for the people can do such modify is no problem to fix their motherboard – resolder the vga chip, or replace vga chip.

The more calculation of vga chip carried, the more heat it generated. Think about how many calculation jobs that vga chip has to do in your situation, not only the internal lcd, but also the external lcd. Much more than those people change lcd from sxga to qxga.

DV6000 laptop power switch problem

Solution The power switch from DV9000 is same as DV6000. There is other way to switch on your machine and you will know if is ribbon cable problem or m/b problem. It is handy if you have a multimeter. The switches of most laptop ( include dv6000) are just pull a voltage to the ground and send a signal to EC (most people call it keyboard controller). So check your ribbon cable connector on the motherboard, on the 3rd pin( can't remember from left or right, but it doesn't matter you can try both) it should have 3.3V, short this pin to the ground and your machine should power up. Don't worry you wouldn't damage anything even you short every pin on the connector to the ground.

Q. I have a Gateway P-6825 Laptop that has no backlight on LCD. I have bought 2 inverters 2 LCD cables I have tons of screens no matter what I get no backlight. It works perfect on external monitor and you can see it come on the LCD but the screen will not light up.

Also what is the normal input power to the inverter as well.

A. Inverter board input power sometimes is Vin or B+, close to AC adapter voltage. You may check if is there a fuse in the LCD connector path. I'd suggest you search for the inverter IC datasheet. For inverters using OZ960 there is an input called ENA which must be 3.3V for enable inverter and another called DIM which is 3V for full brightness. Hope this helps.

Q.I have a Toshiba Satellite Pro A300, just tried to use the dvd rom and it's not working, it won't acknowledge any dvd's, It won't even open, last time I used the dvd rom several months ago everything worked fine and the notebook has not been moved,

A. If the dvd drive it's ok (u should test it in another laptop), it's for sure a chipset problem (the chip that controlls the drive also, it's the intel ICH8M the U33A on the schematic/board).I will exclude a connection port problem if the laptop hasn't fallen or something like that.If drive is ok, try a reflow of that chip, should solve your problem.

Q.Is a Toshiba Satellite L355-D-S7901, motherboard 6050A2175001-MB-A02, after POST starts to beep continously like a stuck key. I've tried even with bare motherboard (no keyboard connected). Will appreciate any idea.

A. check capcitors that keyboard connected, or check keyboard controller.

How to check sony protection circuits

SONY VGN-NS11S MBX-195 M790 Rev 1.1 1P-0087J04-8011 PCG-7141M ,

Sony's protection circuits are hard to troubleshoot. It is involed too many components. About mbx-165 protection circuits:

1. Power pass PF1 becomes DC_IN, at this point, Max1909 start to work. ACIN, DCIN high, LDO 5V, REF 2V(must have, can't remember exactly voltage). Max1909_PDS low to drive PQ25 (don't know exactly voltage, but lower than DC_IN).

2. PQ25 convert DC_IN to DC_IN_MOS. Here comes the hardest to troubleshoot of sony protection circuit.

PQ26's gate must be low and it was a signal call DC_IN_G1. So where this DC_IN_G1 from? In normal situation, it max1909_pds through a resistor. Now, you have 19V of this signal that is abnormal.

we check it by few steps:

1. check pc3, is it short?

2. ac_off_3# is high? if it is high, check check PQ31, PQ20, PR116, PR119, PR120.

3. ac_off_3# is low? check the ac_off_3# signal, many components involved: DC_IN part from PD2 to AC_OFF_3#. From input of PU13 (2nd pin, max1909_LDO) to PQ24A, PQ59, PQ24B.

I hate sony's protection circuit, too many troubles. Last time I fix one of such problem on sony mobo is PD2 leaking, spend me almost 5-6 hours. And solution of it? Just remove the PD2, which means it does not matter if there is PD2 or not the mobo still working. Extra protection means extra troubles and faults.

Q. uSb power problem

A. The following solution only apply that usb no power, if the usb device get power but can't be detected or can't be recognised by system, that indicates south bridge problem.

To get power for usb is very simple. use multimeter to find out which usb pin is ground, the pin on the other side will be the power. for example say pin 4 is ground so pin 1 will be the power.

connect power pin to 5v you can find on motherboard, usually a big inductor(be careful, when you measure the voltage, put battery in as well, some mobo the inductor for charging circut give you 5v if you don't put battery in but jump to battery voltage once you put in the battery, such high voltage will burn your usb devices). connect it on the different side of inductor that mosfet connect to(or should I say power out side?) so you can get smooth waveform, don't connect to the same side of mosfet(this is power in side).

Q. My Lenovo SL400 screen went dark (image there, just very hard to see, a torch will show it is there though).

A. When we fix such problem, usually we do the following:

1. find an known good lamp or screen, plug into inverter see if its light up. if it lights up so you need to change your screen's lamp.

2. if it not light up, do following:

a. check power(either 5V or 19V), enable signal(3V), brightness control(3V) are presented. (all testing be done with adaptar plug in).

b. if all those presented, then change inverter otherwise

c. need to find out which wire is power, which is enable, which is brightness. people find hard in here because they don't know how to find out which is which.

1. Is there a popular model of power supply that you can recommend?

2. Do you use mini-grabbers to attach power supply to laptop or do you have a collection of common dc plugs?

3. How do you use with Dell laptops that have a third wire to identify the power supply?

I just burn one power supply today, this is 4th one I have burnt in last 3 years. Lucky it was not connected to any laptop when it was burnt. It's output voltage was jump from 19V to 50V, at this voltage all laptop's power circuits will burn throuhg, I have 3 laptops burnt before.

There is no popular model as I know, but at least 5A/30V. Get a industrial grade if it possible, becuase non-industrial grade power supply can't even run a laptop for more than one hour, or you face the risk to burn your power supply – in turn it will burn the laptop. It is sufficent for repairing job but not enough for machine testing. It must have MA reading, because sometimes the reading is less than 0.01A.

I have all the collection of DC plugs, made from faulty chargers.

Ignor the 3rd pin of dell charger, it is only for PS_ID, only use for charging battery. Without this PS_ID machine still run but just can't charge. But some old dell like 5150 will not work our power supply, lucky we don't have any such machines to fix.

1. Is there a "generic" current profile for laptops or does each laptop have it's own unique current profile?

2. In your example for DV9000, you say "0.01 – 0.3 -0.9 – 1.1 – 0.9 – 1.2 -1.45 then display" Can you explain what happens at each current change state?

3. Do you need a power supply that logs the current or does it change slow enough to visually monitor the different current states?

4. If a laptop gets power but no video, how do you isolate the failure between northbridge,southbridge,SIO,bios?

1. Every laptop has its unique current profile. But although the reading is different, the up and down (jumping) are similiar.

2. The dv9000's current reading may not very accurate, I suggest you first move the ram away and see how the current changing, then put back the ram and check it again.

3. not very fast, your eyes can catch the changes.

4. this is a big question, may need a full text book to explain it. The simple answer for this question: a. current reading, b. LPC wave, c.SMB wave. we have explain the current reading before. LPC waves are measured on EC, if you can't find LPC wave, that means no communication between EC and SB, PLTRST present or not, if is not then SB problem, etc. SMB waves are measured on ram slot, communication between ram and northbridge, H_RESET present or not, if it is not then NB. There are also so many signals need to check, can't remember what are them now.

I think the hardest fault for beginner is why the laptop not power up, not the faults after it powers up.

lets see the example how we troubleshoot a non-powering machine,:

Model:acer 5737

EC: kbc926

sympton: can't power up

checked: 3ALW, 5ALW presented

1. check the power button has power or not, press it to see if pull down the voltage.

2. check kbc926's 32 pin, which is on/off see the signal received.

3. EC_VCCA is high?

4. check EC_RSMRST is high?

5. LID_SW# is high?

6. ACIN is high?

7. EC_CRY is correct?(32.76Khz)

8. South bridge crystal correct( which is X4, also 32.76KHz)

9. PBTN_OUT pull low when you press power button?

if all above have no problem, consider the south bridge fault. for this machine, there is a single bridge – south bridge/north bridge/vga combined. North bridge's functions are mostly taken over by CPU.

This laptop will run on ac charger it wilL NOT run on full charged battery.

This is what we called protection circuit fault.

Looks like discharging has problem. When discharging mosfet has problem, or the Gate voltage not correct, the 18V of main power will directly go to battery.

The current will be very large when you have short discharging mosfet, if you plug charger in and have battery installed at sametime. Laptop will detect this abnormal current and refuse to start up. Remove either one, machine can start up.

Please Note:

The first step to troubleshooting is monitor the current change. usually, current reading can tell what was wrong and quite accurate.

CPU faulty is rarely happened. I only see no more than 5 to 8 cpu faulty during 10 years.

CPU kills motherboard happen on me once, and that motherboard in turn to kill another good CPU, and this is p3 cpu.

Don't worry about cpu, 99% chance it is good.

Try to do this, find a current meter, cut off the wire of power adaptor, connect current meter to the wire. The meter must be able to read at least 0.01A.

Please visit our website below for solutions to laptop problems - Thanks

http://www.laptoprepairtrainingcollege.com

http://www.laptoprepairtrainingcollege.comMOTHERBOARD REPAIRING STEPSMOTHERBOARD REPAIRING STEPS

MOTHERBOARD REPAIR

maintenance information

Repair parts

Do not turn fault detection method and sequence

1. Check the working conditions of the three CPU

l Power Supply

l clock

l Reset

2. Remove the BIOS chip select pin 22 check whether the signal transition

3. Test for BIOS, search the line connected with the BIOS

4. Charles ISA, PCI, on the data lines, address lines (and AD), interrupt and other control lines (this can be a direct reflection of north and south bridge problem)

5. Charles AGP, PCI, CPU Block North Bridge on the way to determine whether the normal resistance

l CPU core voltage power supply

2 FET bad, open or short circuit

2 short-circuit filter capacitor (electrolytic capacitor)

2, no output voltage IC

No 12V power supply

voltage IC bad

Break

2 CPU voltage related to minor short circuit

2 bad of a field effect transistor, the output voltage becomes lower

2, no effect on the feedback circuit

2 Output voltage and low voltage IC

l VID 0-4, (+5 V voltage)

2, no output voltage IC

2 and the exclusion bad CPU Blocks

2 Break

l VTT 1.5V

2 bad power FET

2 VTT1.5V a right to short-circuit

2 FET power supply is not normal

2 FET bad

l clock

2 CPU Clock Tower and the open circuit between IC

2, no output clock IC

2 and output filter capacitor connected to the bad (10 PF)

2 power supply is normal 3.3V 2.8V 2.5V

2 All no output or no output half

2 from the crystal oscillator 22 is to determine if the bad skin

2 have electricity, IC bad

2, no power, check supply the relevant line

2 IC bad

2 half check for abnormal

l Reset

Low Voltage Reset 2: Bad Northbridge

2 There was no reset voltage

? North Bridge North Bridge without welding or reset false

? Disconnect the line connected with the North Bridge

2 are reset: continuous line with the North Bridge

2 No Reset: Reset generation circuit check

Boot display and related failures to judge

1. Display the information and memory card capacity

2. Shows the motherboard model, manufacture date, BIOS version of the content

3. Shows the main frequency of CPU, (FSB and multiplier)

1) CPU Block bad

2) Jumper Settings Error

3) North Bridge and CPU line between Block

4. Memory capacity

1) bad memory

2) bad memory slot

3) Northbridge bad

4) memory slots poor contact

5. IDE interface status

1) not detected

i. signal line and the hard disk, CD-ROM

ii. IDE Interface needle

iii. Southbridge bad break

2) detection of errors

i. hard drive, optical drive signal line

ii. IDE interface issues

iii. Southbridge bad

iv. Clear CMOS

6. Floppy

1) Setting error

2) signal line and the floppy drive

3) Floppy Interface

4) I / O bad

5) South Bridge bad

7. Keyboard, mouse

1) The keyboard, mouse, bad

2) The relevant line (exclusion, inclusion and exclusion, inductors, resistors, I / O)

3) keyboard lock (CMOS, keyboard lock-related lines)

4) South Bridge, or to break or short circuit between the South Bridge

8. Sound card

1) not detected

i. CMOS off (clear CMOS)

ii. sound card and crystal (no waveform voltage one high and one low)

iii. Supply (78L05)

2) noise

i. input power supply filter capacitor

ii. the output filter capacitor

iii. sound bad

iv. Southbridge bad

9. USB, COM ports, printer port, game port

1) interface bad

2) The power supply is not normal

3) signal line in question

4) I / O or the South Bridge

Memory-related failure to judge

1. Read less memory

? Slot bad

a) bad shrapnel Contact: oxidation, stretch out of control, open

b) short circuit burned out groove: two-pin short circuit, damaged

? Memory-related lines: one slot short circuit; power supply; clock; ranks gating; lines are open; data line; address line; control line; Northbridge bad (most of the relevant line with the North Bridge)

2. Digital jump incomplete

C0-C1-C3-C5 (no C3 and C5, are related to line problems)

3. Memory error

? Memory bad

? Access to good

? Slot problem with the line between the North Bridge

4. Into 98 missing characters: the bad memory

5. After the crash into the 98: the bad memory

6. AGP slot short circuit - effect Northbridge, RAM

7. BIOS error or data loss

? Virus infection

? Upgrade fails

? Power supply does not

Note: The clock IC are sometimes not read memory

Diagnosis of Different motherboards have different number of cards to go, often have the following three kinds:

1:00-C0-C1-C3-0b-0d-3d-42-6F-7F-FF

2: FF-C1-1d-2b-3d-42-6F-7F-FF

3: FF-d3-d4-0b-2A-31-3d-4E

Sound Card Trouble

1. Power Supply

78L05 12V power outlet to the three-terminal regulator input pin, the output is 5V voltage to the IC card

2. IC card to work should be hot

1-12 feet which is more important, including the power supply, crystal oscillator, two feet, the control signal

3. Crystal

24.576MHz, next to two small capacitor 22PF

? Have a power waveform

? Into the 98 after a wave

? Only level, no wave, one high and one low voltage

4. PA

Just the sound card output audio signal amplification (amplifier sound bad cause little noise, no sound)

Failure of some of the problems caused by sound card

1. Power Supply

2. Crystal

3. Sound card chip

4. PA

5. Sound card and amplifier small capacitor around

6. CMOS setting error will cause silent, not the sound card installed

7. BIOS Bad

NOT NEED THE MOTHERBOARD SERVICE MANUAL FOR ASUS,GIGABYTE,MSI FOLLOW ABOVE STEPS

MOTHERBOARD REPAIR

maintenance information

Repair parts

Do not turn fault detection method and sequence

1. Check the working conditions of the three CPU

l Power Supply

l clock

l Reset

2. Remove the BIOS chip select pin 22 check whether the signal transition

3. Test for BIOS, search the line connected with the BIOS

4. Charles ISA, PCI, on the data lines, address lines (and AD), interrupt and other control lines (this can be a direct reflection of north and south bridge problem)

5. Charles AGP, PCI, CPU Block North Bridge on the way to determine whether the normal resistance

l CPU core voltage power supply

2 FET bad, open or short circuit

2 short-circuit filter capacitor (electrolytic capacitor)

2, no output voltage IC

No 12V power supply

voltage IC bad

Break

2 CPU voltage related to minor short circuit

2 bad of a field effect transistor, the output voltage becomes lower

2, no effect on the feedback circuit

2 Output voltage and low voltage IC

l VID 0-4, (+5 V voltage)

2, no output voltage IC

2 and the exclusion bad CPU Blocks

2 Break

l VTT 1.5V

2 bad power FET

2 VTT1.5V a right to short-circuit

2 FET power supply is not normal

2 FET bad

l clock

2 CPU Clock Tower and the open circuit between IC

2, no output clock IC

2 and output filter capacitor connected to the bad (10 PF)

2 power supply is normal 3.3V 2.8V 2.5V

2 All no output or no output half

2 from the crystal oscillator 22 is to determine if the bad skin

2 have electricity, IC bad

2, no power, check supply the relevant line

2 IC bad

2 half check for abnormal

l Reset

Low Voltage Reset 2: Bad Northbridge

2 There was no reset voltage

? North Bridge North Bridge without welding or reset false

? Disconnect the line connected with the North Bridge

2 are reset: continuous line with the North Bridge

2 No Reset: Reset generation circuit check

Boot display and related failures to judge

1. Display the information and memory card capacity

2. Shows the motherboard model, manufacture date, BIOS version of the content

3. Shows the main frequency of CPU, (FSB and multiplier)

1) CPU Block bad

2) Jumper Settings Error

3) North Bridge and CPU line between Block

4. Memory capacity

1) bad memory

2) bad memory slot

3) Northbridge bad

4) memory slots poor contact

5. IDE interface status

1) not detected

i. signal line and the hard disk, CD-ROM

ii. IDE Interface needle

iii. Southbridge bad break

2) detection of errors

i. hard drive, optical drive signal line

ii. IDE interface issues

iii. Southbridge bad

iv. Clear CMOS

6. Floppy

1) Setting error

2) signal line and the floppy drive

3) Floppy Interface

4) I / O bad

5) South Bridge bad

7. Keyboard, mouse

1) The keyboard, mouse, bad

2) The relevant line (exclusion, inclusion and exclusion, inductors, resistors, I / O)

3) keyboard lock (CMOS, keyboard lock-related lines)

4) South Bridge, or to break or short circuit between the South Bridge

8. Sound card

1) not detected

i. CMOS off (clear CMOS)

ii. sound card and crystal (no waveform voltage one high and one low)

iii. Supply (78L05)

2) noise

i. input power supply filter capacitor

ii. the output filter capacitor

iii. sound bad

iv. Southbridge bad

9. USB, COM ports, printer port, game port

1) interface bad

2) The power supply is not normal

3) signal line in question

4) I / O or the South Bridge

Memory-related failure to judge

1. Read less memory

? Slot bad

a) bad shrapnel Contact: oxidation, stretch out of control, open

b) short circuit burned out groove: two-pin short circuit, damaged

2. Digital jump incomplete

C0-C1-C3-C5 (no C3 and C5, are related to line problems)

3. Memory error

? Memory bad

? Access to good

? Slot problem with the line between the North Bridge

4. Into 98 missing characters: the bad memory

5. After the crash into the 98: the bad memory

6. AGP slot short circuit - effect Northbridge, RAM

7. BIOS error or data loss

? Virus infection

? Upgrade fails

? Power supply does not

Note: The clock IC are sometimes not read memory

Diagnosis of Different motherboards have different number of cards to go, often have the following three kinds:

1:00-C0-C1-C3-0b-0d-3d-42-6F-7F-FF

2: FF-C1-1d-2b-3d-42-6F-7F-FF

3: FF-d3-d4-0b-2A-31-3d-4E

Sound Card Trouble

1. Power Supply

78L05 12V power outlet to the three-terminal regulator input pin, the output is 5V voltage to the IC card

2. IC card to work should be hot

1-12 feet which is more important, including the power supply, crystal oscillator, two feet, the control signal

3. Crystal

24.576MHz, next to two small capacitor 22PF

? Have a power waveform

? Into the 98 after a wave

? Only level, no wave, one high and one low voltage

4. PA

Just the sound card output audio signal amplification (amplifier sound bad cause little noise, no sound)

Failure of some of the problems caused by sound card

1. Power Supply

2. Crystal

3. Sound card chip

4. PA

5. Sound card and amplifier small capacitor around

6. CMOS setting error will cause silent, not the sound card installed

7. BIOS Bad

NOT NEED THE MOTHERBOARD SERVICE MANUAL FOR ASUS,GIGABYTE,MSI FOLLOW ABOVE STEPSHere Attach Some Most Problem in Desktop Motherboard

May be some debug card can't display same LED status All error Referance from Standard Debug Card.

Debug card LED can glow using bit voltage (Because of Mobile LED)

Debug Card :

4Digit P.O.S.T Debug card Ver. PI0050A

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Bios Can't Execute POST.

LED STATUS

RST OFF

OSC FRAME OFF

CLK ON

BIOS ON

ALL VOLTAGE ON

Solutions:

Any of One or More Following Parts Not Working. Check All Parts Step by Step.

Most common problem on dead motherboard Reprogramme Bios, Check all mosfet, voltage regulator ic's, track cut or dry solder, I/O Controller ic, Northbridge, Southbridge.

CPU Can't Heat.

LED STATUS

RST ON

OSC FRAME OFF

CLK OFF

BIOS ON

ALL VOLTAGE ON

Solutions:

Any of One or More Following Parts Not Working. Check All Parts Step by Step.

Mismatch CPU or CPU not Support, VRM Buck Controller ic,(ADP,RT,ISL,Etc.) VRM Mosfet Open, track cut or dry solder, VRM capasitor and coil filter, I/O controller can't execute VID Signal for Buck Controller (only for jumperless board), North Bridge Short or Open.

Some 775 socket Motherboard Buck Controller Power Supply ic APW7120,RT9214,UP6321

North Bridge Power on Problem

LED STATUS

RST ON

OSC FRAME ON

CLK ON

BIOS OFF

ALL VOLTAGE ON

Solutions:

Any of One or More Following Parts Not Working. Check All Parts Step by Step.

Between the PCI slot and northbridge Mosfet open, Northbridge drysolder, Northbridge not working, track cut.

Hold POST Code

LED STATUS

RST OFF

OSC FRAME ON

CLK ON

BIOS ON

ALL VOLTAGE ON

Solutions:

Any of One or More Following Parts Not Working. Check All Parts Step by Step.

Track cut, dry solder, Bios currupt, mismatch cpu and ram frequancy, i/o controller, mosfet, clock ic, Northbridge, Southbridge.

RESET PROBLEM

LED STATUS

RST ON

OSC FRAME OFF

CLK ON

BIOS OFF

ALL VOLTAGE ON

Solutions:

Any of One or More Following Parts Not Working. Check All Parts Step by Step.

Reset Problem means not any one or more controller ic can reset it self before execute post code.CPU, I/O Controller, Clock IC, Mosfet ,Buck Controller ic, Voltage Regulator ic's, Northbridge, South Bridge.

Memory Problem

Solutions:

Clean Memory Slot & Memory , ram power supply , network resister between the gmch and ram slot , cpu , bios reprogramme .

Motherboard Display Ok

Motherboard Working ok condition LED Status

LED STATUS

RST ON After 1 Second OFF (Reset Function Always on after 1 second goes to off )

OSC FRAME BLINK (Frame is a Signal of DATA so it is always Blinking)

CLK ON (Clock is a 14 Mhz Crystal IC on signal it is always on)

BIOS ON (Bios or IRDY is a same Signal it is Always on)

ALL VOLTAGE ON (All Volt Indicate SMPS all Supply Work Properly. Always on)

LAPTOP POWER SUPPLY

LAPTOP MOTHERBOARD POWER ON DETAIL

V2000/m200/dv1000 power on steps detail signals with diagram and step explanation

3VPCU, 5VPCU , +5V, +3V 5VSUS, 3V SUS, NBSWON#, DNBSWON# SUSC# SUSB#, SUSON, MAINON, VRON S5_ON, HWPG, POWERGOOD, VCCP, VCORE SMDDR_VTERM, PWROK, RSMRST, PCIRST,CPUINIT,CPUPG, IMVPOK, CLK_EN# CPURST,

HP, CQ40 series power on boot process signals and chip detail

AD-OFF DCBATOUT TO_SYS. ACAVIN PWR_S5_EN 5V-PWR 3DE-PWR PWR-S5-EN 5V-PWR 3D3-PWR +3 VALW, +5 VALW +3 VALW, +5 VALW +3 VALW RSMRST-SB #BT-TH # PWR_BTN PWBTN-SB PM-SLP-S3 # PM_SLP-S4

ALL-PWRGD VR ON PM-PWPOK CPU PG PLT-RST

Dell laptop d600 boot process main signals detail

+ RTC_PWR5V & + RTC_PWR3_3V, + RTCSRC, (PWR_SRC) DCIN +, + DC_IN, SDC_IN +, ACAV_IN (+5 VALW & +3 VALW) LIVE_ON_BATT . power good VCC1_PWROK

IBM T40 POWER BOOT DETAIL SIGNALS

Component Level Motherboard Repair (Not replacement)

1) How do you diagnose the exact component failure?

Obviously, a burn mark is a dead give away, but what if there are no visual signs? Do you poke around with a multi-meter? With what voltage settings and how do you know what to look for?

2) Is it usually a bad capacitor?

badcaps seems to think so. What about a bad connection?

3) How do you perform the component level repair?

So you've found the bad capacitor or component, can you really solder a new one on without hurting the components around them? What's a good soldering iron for under Rs.200?

Answers to your questions

Diagnose problem:

This is the hardest part in notebook repair. Basically, we measure voltages on motherboard and there are few power supply range from 1V to 12V on the motherboard. For example, north bridge needs 1.05V, 1.2V, 1.5V, 1.8V, 2.5V, depends on model of north bridge. We also measure all sort of signals, such as PCIRST, CPURST, CLK. We measure the resistances of each AD line from north bridge to CPU/RAM.

We watch the current changing patterns to get rough idea where is the problem. There are some simple steps to follow when checking a notbook motherboard:

1. make sure main system powers are ready, that is 3V and 5V.

2. switching circuit is ok, which involes IO/Keyboard controler, south bridge

3. power sequence is ok, which you can see the current jump up and down for few times.

4. all the necessary signals are not missing.

About Bad Cap

It happens but only about 10% in those motherboards need to repair, and it is the easiest fault to repair not matter if the cap was burnt or not.

Loose connection

Mostly happen on VGA chips, south birdges and the places close to CPU. Hard to troubleshoot and need lot experiences.

How to repair?

I have seen the video in youTub teach people how to fix VGA problem, and I guess you only have 30% chance if you follow it. My BGA rework station tutorial can perform up to 95% successful rate.

Troubleshooting Dead HP G6000 Motherboard

Things that are likely worth solving:

Bad capacitors. Decently common and the parts only cost a few cents.

Most of the ICs on board... 4-20 pin jobbies such as the power ic do fail and are swappable for less than a buck or so

Blown fuses. Easy to diagnose easy to replace. This is a definite.

Any and all damaged jacks. Power and audio being the most commonly broken.

Resistors. easy to find easy to replace. cost is in pennies

Transistors and diodes can be more problematic to diagnose and fix but they too are cheap and swappable with just a soldering iron.

Obviously you can swap cpus so you should be able to diagnose that as well.

Case Study 1

"Machine: HP G6000(same mainboard as V6000)

Problem: Laptop will not power up, completely dead

Discription: The machine has been water damaged. It does not have system standby power, which are 3V and 5V.

Finding The Fault:

Everything ok except 10 pin, ACIN is 0V. This is incorrect, mainboard doesn’t detect there isHomeHomeHome

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Laptop Motherboard Chip Level Repairing and Training

You are here:Home » Laptop Motherboard Chip Level Repairing and Training

Block diagram of laptop motherboard

Chapter 1 Block diagrams of motherboards, understand different chips on motherboard

Understanding block diagram of motherboard, connecting different chip with bus. Address bus, data bus, control bus, CPU, North Bridge, south bridge, IO controller, audio, lan etc, identify different chips on motherboards, power supply chips,

Chapter 2 Basic working details of motherboards,

What is the basic requirement to run motherboard , power, reset clock and software(bios) , different chip required different power and power with different ampere also each power section generate power,

Chapter 3 A list of tools required for repairing laptops

Soldering iron, screwdriver sets, smd rework, Bga machine, micro iron, ram cpu wifi slot tester Bios programmer, Ram slot tester, Different Debug card, Multimeter, Cro, etc

Basic difference between laptop motherboard and desktop motherboard

Chapter 4

Basic differences between laptop and desktop motherboards, components difference, etc…Power supply section, 12v 5v 3.3v pgood, pson, sus, 2,5v 1,5 vcccore, clock, bios, cpu power supply,

Chapter 5 Power, reset, clock, frame stage understand

Understand how power is required for each chip and how it’s generated; what clock frequency is required by each chip and which section generate it

Power stage of laptop motherboard

Chapter 6 Primary powers, secondary, RAM VRM, etc. PCU MAIN SUS POWER

How many types of power, how primary voltage is 5v pcu 3.3v pcu voltage generated from 18v vin , When 5v main and 3.3v main start, when secondary voltages generated 2.5v and 1.5v generate from 18v , When ram power supply 1.8/ 2.5/ 1.5 v start, when CPU gets vcccore supply with 25 ampere power supply from VRM section

Chapter 7 How a motherboard starts basic concepts / Different power stage (S0, S1, S2, S3, S4, S5), discharge section, on. off section

What is process after power supplies reach each chip? When reset signals start? When power good generate? When motherboard starts to searching bios,how many types of power stage is there? What is s0 ,s1 ,s2 ,s3 ,s4 ,s5 power status , what is different between standby, hibernate mode , which chip gets what power in standby, hibernate, on, off stage, When discharge section works, what is the function work of discharging section, Sequence of motherboard on/off, how motherboard switches on procedure

Chapter 8 MOSFETS & USED, SWITHCHING AND REGULATOR POWER SUPPLY

How to check mosfet? How source and drain are managed by gate signals? What is dual and single smd mosfet? What is the function of mosfet in power supply? How to find about mosfet whether it is dual or single? How to replace mosfet with other equivalent mosfet? Mosfet used in VRM, switching power supply, linear output etc example

Chapter 9 Understand Power on Stages signals of laptop motherboard (Compaq v2000/dv1000)

(3VPCU, 5VPCU , +5V, +3V 5VSUS, 3V SUS, NBSWON#, DNBSWON# SUSC# SUSB#, SUSON, MAINON, VRON S5_ON, HWPG, POWERGOOD, VCCP, VCORE SMDDR_VTERM, PWROK, RSMRST, PCIRST,CPUINIT,CPUPG, CLK_EN# CPURST)

Different section of laptop motherboard with different chips

Chapter 10 Understanding laptop schematic diagram tracing , with different chips and signals detail

Understanding whole block diagram thru schematic diagram with page no

CPU section (INTEL, AMD,) what are the important signals of CPU? Understand basic signals of CPU, CPU different power vcccore, connection of CPU with other chips.

NORTH BRIDGE, :- understand basic signals of north bridge, Northbridge different power supply, connection with different chips

GRAPHICS CHIP :- Why graphics chip used, what problem created by graphics chip, mainly types of graphics chips, nvdia, ati,

RAM MEMORY POWER SUPPLY :- Important signals of RAM, understand basic signals of Ram, Ram different power supply, connection with north bridge

SOUTH BRIDGE ;- What is basic function of south bridge, Southbridge different power supply, connection with different chips,

I/O CONTROLLER (power chip control section) :- Main signals of i/o chip, i/o chip contain power control chip in some models, connection and function of i/o chips

LAN NETWORK CHIP :- Function of network chip, connection of network chip

AUDIO SOUND CHIP :- Function of sound audio chip, connection of sound chips

CPU TEMPERATURE CONTROL :-

BIOS section :- Award, phonix, amibios,compaq, ibm :- Type of bios chip , main signals of bios chip, connection with i/o & southbridge signals, cmos battery power supply to bios chip ,

CLOCK GENERATOR CHIP :- Clock generator chip oscillate frequency to different chip, main signals of clock chips,

LCD BACK LIGHT CONTROL:-

Chapter 11 different power supply chips and signal detail

ALWAYS POWER ON :- pcu, main, S5 power , aux etc

PRIMARY VOLTAGE :- 5V 3V sus , main, so,,s3, Power

SECONDARY VOLTAGE :- 2.5, 1.8V sus main, so, s3, s4 power

OTHERS POWER CHIP 1.2, 1.4, 1.5V , sus , main , so s3 s4 power

Cpu core VRM voltage Regulator Module :- Main signals of vrm chip Function of vrm chip measure vrm input and output signals, VRON, PGOOD ETC

Battery charging :- Pinout of battery connection, battery chip, important signals of battery chip, tracing signals of battery

[/accordion]

Chapter 12 LCD & inverter connection

Main signals of LCD, connection from north bridge, how inverter work, main signals of inverter, use of universal inverter,

[/accordion]

Different power supply section and working detail

Chapter 13 Main PCU voltage signals (always on voltage )

Testing and working of main pcu voltage output, main signals of pcu voltage, supply of pcu voltage to other chips, different between MAIN & SUS voltage

Chapter 14 Primary voltage output MAIN SUS (5v,3.3v)

How primary voltage is generated? Main signals of primary voltage MAIN/SUS, supply of main voltage to different chip

Chapter 15 Secondary voltage output SUS MAIN (2.5v,1.5v)\

How secondary voltage output is generated? Main signals of secondary voltage

Chapter 16 VRM section & pci Reset signals

How VRM section start, how identify about CPU types, vid signals, when pci reset signals start, power good signals, etc

Motherboard main signals and power detail

Chapter 17 Power stages of other laptop motherboards main signals

Understand power on concept of HP LAPTOP motherboard

(Compaq AD-OFF DCBATOUT TO_SYS. ACAVIN PWR_S5_EN 5V-PWR 3DE-PWR PWR-S5- EN 5V-PWR 3D3-PWR +3 VALW, +5 VALW +3 VALW, +5 VALW +3 VALW RSMRST-SB #3 \; z7 o# m8 [/ `+ I& j" Y! ^2 XBT-TH # PWR_BTN PWBTN-SB PM-SLP-S3 # PM_SLP- S4 ALL-PWRGD VR ON PM-PWPOK CPU PG PLT-RST)

Understand power on concept of Dell laptop motherboard

(+ RTC_PWR5V & + RTC_PWR3_3V, + RTCSRC, (PWR_SRC) DCIN +, + DC_IN, SDC_IN +, ACAV_IN (+5 VALW & +3 VALW) LIVE_ON_BATT . power good VCC1_PWROK +5 VSUS & +3 VSUS +2 _5VSUS & +1 _5VSUS PWRSW_SIO # SUS_ON +3 VSRC SUSPWROK_5V RUN_ON +5 VRUN, +3 VRUN, +1 _8VRUN, +1 _5V RUN, M7_MEM, M7_CORE, M7_1.8V SMDDR_VTERM 1.25V RUNPWROK CPU VTT VCC1_2_MCH RESET_OUT # VCORE_PWRGOOD, 1715PWROK, IMVP_PWRGD CPUPWRGD SLP_S1 # IMVP_PWRGD VTT_PWRGD # DELAY_IMVP_PWRGD )

Understand power on concept of IBM laptop motherboard

(VREGIN16, VINT16 VCC3SW , VCC5M , VCC3M , VCC1R2M VCC1R8M, MPWRGD, VCC3B, VCCCPUCORE for CPU, VBAT, DC –IN, VCC5B, VCC3A, VCC3B, VCC3P, VCC1R8A, VCC1R8B, VCC1R2A, VCC1R2B, VCC2R5A, VCCVIDEOCORE, VCCCPUIO, VCCCPUCORE)

Testing of motherboard signals cold and warm testing

Chapter 18 Testing with multimeter different signals

How to check all voltage of motherboard? Primary, secondary, PCU, MAIN, SUS Volt, how to find shorting on motherboard, different test points to check voltages.

Chapter 19 How to use CRO basic concepts , Testing with CRO (stepwise)

Types of cro [analog digital], difference between cro, How to connect to cro, how to use probes of cro, setting of cro, checking dc volt thru cro, self test of cro, auto setup of cro, how to check frequency of clock in motherboard?

Chapter 20 Testing outputs and inputs of Mosfets, testing clock, testing reset signals

Mosfet output and input gate to check with multimeter and cro [the difference], Checking process of clock using cro and multimeter.

Cleaning motherboard solution steps

Chapter 21 Washing, Cleaning, drying the motherboard

How to wash motherboard to clean, procedure after washing, how to Dry the motherboard.

Dry solder problem solution steps

Other main problem occurs due to dry solder problems, some contact of chips or component may dry, what is process? How to solve dry solder problem, demo of baking oven to dry motherboard, heating using a hair drier,

Chapter 22 Removing and inserting different chips practice (video & step)

Replacing different ICs, using soldering irons and smd blower etc…

BGA rework removing and reballing of BGA chip of motherboard

Chapter 23 ICs rebelling, BGA ball arrangement, practice., Using BGA machine

Training Using BGA Soldering Station,

Removing BGA Chips and Rebelling It Using Reball Stencil

Two methods

1st by applying balls with help of BGA station

2nd applying liquid paste PPD and heat with BGA blower

Introduction to different BGA machines

Infrared and normal blower, introduction to 3 different Machine we

Used low end to high end, different method of reboll a chip, why is reballing required

1st method (inserting BGA balls using stencils)

2nd method (using a direct paste application)

Practice with BGA rebolling

Removing and inserting BGA chip practice

BGA reballing process (videos and notes)

Chapter 24 Removing bios password process notes and device used

Dell sorting process, IBM read chip process, Hash code, Different devices used to remove passwords

Different slot tester detail RAM, CPU, HDD etc

RAM slot tester, CPU slot tester, WIFI slot tester , HDD slot tester, Mini PCI debug card 3in1 5in1, debug with lcd display

Chapter 25 Bios update concept common fault and solution detail

Post code error of different debug card and bios; program Update Bios Method USB – EXE Bios working Detail

Chapter 26 Testing and fault finding method

debug card mini PCI 3in1, 5 in1, debug with lcd display, , What is process to find faults using debug card, Mini PCI debug card, Debug cards code error list of different bios award phonex amibios etc

Chapter 27 REPAIRING TIPS AND VIDEO COLLECTION OF LAPTOP REPAIR

Some basic videos collection with some common fault and solution collected from other sides for reference

Chapter 28 DEMO FOR OTHER PRODUCTS AVAILABLE FOR SALE

Introduction to module 3 syllabus, technical support, Laptop schematic diagram collection, laptop repairing advance tips collection, different models different problems collection, different board having difference power chips with name, lots of service centre collection

Free with this course:

Laptop schematics diagram basic, different instrument list, common faults list of laptop repair and laptop service manuals collection, data sheet of chips, laptop power on sequence notes, etc

Different chip used in different section collected from laptop schematic diagram by Intersoft institute

Northbridge chip

(1021 FCBGA,1257 BGA,1299 PCBGA,1329 FCBGA,1466 BGA,465 FCBGA,593 BGA,625 BGA, 705 BGA, 707FCBGA, 718-pin BGA, 732 BGA, 760 BGA, 82875GM/GME, 836 BGA, 855GM, 868 BGA, 910GML, 945GMS, 965GM/965PM/ 1299 Pin FBGA, ALI M1632-C, Alviso 1257 PCBGA, ATi RC300ML, ATI RC410MB, ATI RS482M, ATIR200m, ATI-RX485M, BGA 468, BGA 732, C51M/D, CALISTOGA, Crestline GM, CRESTLINE-GP-U, FCBGA 1299, FCBGA 1329, FCBGA U43, FCBGA836-NVIDIA-MCP67, Intel 855GME, Intel 910GM, Intel 945pm, MCP67, GM 732 BGA, PCBGA 1257, PCBGA 1466, PM45, GM45, PM965, RC300-MD, RC410MB ATI, RC415ME, RS600ME, RS690T FCBGA, RS780MC, RX485 /465 FCBGA, RX781/RS780MN A12, SiS 672, SIS 756, UFCBGA – 1329, UFCBGA-1299, uFCBGA-1466, uFCBGA-593, UFCBGA-732, uFCPGA638, Ver.:A13, 71.RC410.D0U

Graphics chip

(nf-430-n-a3, g6150, g-6100, Spp-100-n-a3, 7200-n- a3, g86-630-a2, 7200-b-n-a3, 7400-g-n-a3, Mcp 67MU-a2, Mcp 67M-a2, 7600-n-a2, 7600-h-n-b1, ATI IXO460, g86-770-a2, g 7200-b-na3, gf -7200-n-a3, go 7400n a3,NVIDIA NF-SPP-100-N-A2 ,NVIDIA NF-G6150-N-A2, NVIDIA NF-G6150-N-A2, NVIDIA NF-G6100-N-A2, NVIDIA NF-7100-630I-A2, NVIDIA NF-6100-A2,NVIDIA NF-430-N-A3,NVIDIA MCP77MV-A2 ,NVIDIA MCP77MV-A2,NVIDIA MCP67MV-A2,NVIDIA MCP67MD-A2,,NVIDIA MCP67M-A2,NVIDIA MCP67D-A3,NVIDIA GF-GO7900-GSN-A2,NVIDIA GF-GO7600-N-B1 ,NVIDIA GF-GO7600-N-A2,NVIDIA GF-GO7600-H-N-B1,NVIDIA GF-GO7400-N-A3 ,NVIDIA GF-GO7400-B-N-A3,NVIDIA GF-GO7300-N-A3,NVIDIA GF-GO7200-N-A3 ,NVIDIA GF-GO7200-N-A3,NVIDIA GF-GO7200-B-N-A3,NVIDIA GF-G07400-N-A3 ,NVIDIA GF-G07300-N-A3 ,NVIDIA GF-G07200-N-A3 ,NVIDIA GeForce GO6600,NVIDIA GEFORCE FX Go5700-V,NVIDIA Geforce FX Go5700,NVIDIA GeForce FX Go5200 64mb,NVIDIA Geforce FX Go5200,NVIDIA G96-600-A2,NVIDIA G86-770-A2,NVIDIA G86-750-A2,NVIDIA G86-731-A2 ,NVIDIA G86-730-A2,NVIDIA G86-703-A2,NVIDIA G86-635-A2,NVIDIA G86-631-A2 ,NVIDIA G86-630-A2 ,NVIDIA G86-630-A2,NVIDIA G84-750-A2,NVIDIA g84-600-a2,

RAM MEMORY POWER SUPPLY chip

(TPS5116, PC4800, MAX8794 NCP5201 SC1486/SCl486A SC2616 TPS51020 ISL6520 CM8501c, ISL6224 ISL6225,)

SOUTH BRIDGE chip

(609 BGA, 352 BGA, 421 BGA, 443BX, 457 BGA, 546BGA, 549 BGA, 564 BGA, 652 BGA, 676 BGA, 82801 DBM, ALI M1535, ATA 66/100, ATI SB 450, ATi SB200C, ATI SB450, ATI SB460, ATI-IXP150, ATI-SB200, ATI-SB460, BCM5787MKMLG/5764M, BGA – 679, BGA 421, BGA 508, BGA-609, BGA-652, BGA-676, C9827, ICH6 609 BGA, ICH7-M 652pin BGA, ICH8-M 676pin BGA,MBGA-609, mBGA-652, mBGA-676, MCP51, MCP67, NB82801HBM/676 Pin BGA,NVIDIA MCP67 /MCP67D,SB150, SB460 /549 BGA, SB600, SB700, SIS 964L, SiS 968, VT8606,)

I/O CONTROLLER (power chip control section)

(47N217, 82802AC, CS954217, EC ITE8510E, EC KB910L, EC WPCE775L, ECE5028, ENE KB926, ENE3310, ENE3925, H8S – 2110B,IT8510E, ITE 8512E, ITE7805, ITE8712, KB3920 Box / KB3926, KBC PC8769L,KBC 87541V, KBC 87570,LPC 47N253, LPC47N207, LPC47N217, LPC47N354,M38857, MEC5004, MEC5025, NC87381, NS EC87591L, NS PC87383, PC97541, PC97551, NS87381, NS97551/87541, PC8394T, PC87382, PC87385, PC87391, PC87392, PC87393, PC87570,ECE 5028, LPC47N227, SMC 207, SMC217, SMC972 8051, SMs FDC47N227, SMSC1122,SMsC 47N217, SMSC 5021, SMSC1070, SMSC 47N417,SMSC5025, SMSC1100L, SMSC1021, PC87381, wpc775f, WPCE773, WPC776, WPC8763,WPC8769, WPCE773, WPCN385)

LAN NETWORK CHIP

(82573, 3945ABG, 4401E/578X/5705E, 8100C, 811C, 82550GY, 82562ET, 88E1116,88E3018, 88E8036, 88E8038 / 88E8055, 88E8039, 8E8053, 8E8071AR8121, ATheros AR8121, Atheros AR8131,B5788M, BCM 5705, BCM 5751M, BCM 5787M, BCM4401, BCM5752, BCM5753M,BCM5755M, BCM5756M, BCM5764, BCM5784M, BCM5788, BCM5906, Broadcom 5906M, BROADCOM 5787M, Broadcom 5752)

AUDIO SOUND CHIP

( AD1881A, AD1981B, AD1981HD, AD1984JCP, AD1986A,ALC 250, ALC 262, ALC 268, ALC 272, ALC200, ALC202, ALC260, ALC268,ALC269, ALC650, ALC655, ALC660, ALC861, ALC880, ALC861, ALC883,ALC885/889, ALC888, AMC97, Codec_IDT9271B7,CS4202, CS4299, CS4624, CX20468-31, CX20549-12, CX20561, ES1988, G1431Q,CX20468-31,ALC268, ALC882, ALC883, ALC663, RTL 250, RTL 250, STAC 9228, STAC9200,STAC9205, STAC9228, STAC9228/92HD73C, STAC9721, STAC9750, STAC9751,Intel 82566MM, BCM5906, BCM4401, MARVEL8040, Marvell 88E8039, NS83816, PI3L500ZFEX)

CPU TEMPERATURE CONTROL :-

(MAX1617, MAX1020A, AD1030A, CM8500 MAX1989 DS1620)

BIOS section

Award, phonix, amibios,compaq, ibm

CLOCK GENERATOR CHIP

(74CBT3383, ALPRS355B, ASMP3APG1E8, ASMP3APG1E8,C9827,CK 408,CK410M,CK505,CS950810,CS954217,CS9LPRS476,CY28346 ,ICS950810,CY28411/ICS95420,CY28547,CY28548,ICS 9248-195,ICS 94239, ICS 950806,ICS 951412,ICS 954226,ICS 954306,ICS 954310,ICS 9LPR365,ICS 9LPR502,ICS 9LPR600,ICS 9LPRS355,ICS 9LPRS365,ICS 9LPRS480BKLTF,ICS 9LPRS502, ICS CK410, ICS/9LPR363, ICS ICS954218, ICS9250-38, ICS945306,ICS950223, ICS950815, ICS951402, ICS951411, ICS951413, ICS951461, ICS951462, ICS951463, ICS953805, ICS954201, ICS954201BG-T/CY28411, ICS954206, ICS954213, ICS954226, ICS954301, ICS954305, ICS954309, ICS95461, ICS9LP306, ICS9LPR316, ICS9LPR363, ICS9LPRS325,ICS9LPRS355,ICS9LPRS365,ICS9LPRS387,ICS9LPRS476,ICSRTM875T,IDT CV125,IDTCV137,IMISG556B,MLF68,PI6C410M,RS200M, RTM865-300, RTM875N, RTM880N-795, RTS5158E, SKT638S1, SLG84450, SLG8LP554, SLG8SP510, SLG8SP512, SLG8SP513, SLG8SP553, SLG8SP553V)

COM PORT CHIP:-

(MAX3243, MAX213, ADM213, HIN213, SP3243, MC145583

LCD BACK LIGHT CONTROL :-

(MAXl522/MAXl523/MAXl524 OZ960,)

Primary voltage 5V 3V

(ACES 88069-1600A, FDS6680, ICS950810, ISL6225, ISL6236, ISL6237,MAX1 902EAI_SSOP28, MAX190, MAX1977, max1980, MAX1999, MAX8734, MAX8743, MAX8744, MAX8778, MIC5235, PC87383, RPC87383, RT8206, RT9026, SC1403, SL4435, SL6236, SN0608098,TPS51020, TPS51120, TPA51125, TPS2231, TPS51020, TPS51029, TPS51100, TPS51221)

Secondary voltage 2.5, 1.8V

APL5331,APL5912, APW7057KC, BCP69-16, BD3550, BQ24703,CM6582, CS951402AG, EMC4002, FAN5234, FDC 602P, G2997, G965,ISL6225, ISL6227, ISL6228, ISL6236, ISL6262A, ISL88550, LM317, LTC1871, TC3728,MAX1715, MAX1510, MAX1589, MAX1632, MAX1644/MAX1792, MAX1714, MAX175,MAX1806, MAX1844, MAX1845, MAX1992, MAX1993, MAX1999, MAX8550,MAX8632, MAX8717, MAX8743, MAX8778, MIC37101, MIC5219B, MIC5258, NPC5214,PS51124, RT9025, SC1486, SC338a, SC411, SL4465, SL6225,T51124, TPS5130, TPS51020, TPS51124, TI51116, TPS51117, PS51120, TPS5116, TPS5130

OTHERS POWER CHIP 1.2, 1.4, 1.5V

(AGP-M10/11, APL5331, APL5930, APW7057, APWP7A0G5E7, BD4175, CM2843,CM3718, CM8562, FDS6690AS, G2997F6U, G957, G971,ISL6225, ISL6227, ISL6262A, LM2728, LMS5258, LTC1772, LTC3728, MAX 1993,MAX1 902, MAX1540, MAX1544, MAX1632, MAX1644/MAX1792, MAX1714, MAX1715, MAX1718, MAX1844, MAX1845, MAX1992A, MAX8578,MAX8632, MAX8717, MAX8725, MAX8736, MAX8743, MAX8743, max8778,MAX8873, MAX8873, MIC5219B, NDS8425, PS51124, RT8204, RT9026,SC1485, SC338a, SC411, SC412A, SC415, SC4215, SC483, SC486, SI4465, SN0508073P,TPS51124, TPS51100, TPS51124, TPS5117, TPS5130, TPS51483, VT351)

Cpu core VRM voltage Regulator Module

(74CBT3383, ADP3208, ADP3203, ADP3205, ADP3207, ADP3207, ADP3208, c8110,MAX8774, HIP6301/6302CB, MAX1987,ISL 6215, ISL6218, ISL62 27, ISL6208, ISL6215, ISL6217, ISL6218, ISL6219, ISL6227,ISL6247, ISL6248, ISL6260, ISL6261, ISL6262, ISL6265, ISL6266A, ISL6268, LM2729, LTC3735,MAX1987, MAX1532, MAX1544, MAX1546, MAX17080, MAX1711, MAX1718/1887, MAX1714, MAX1887, MAX1907, MAX6656, MAX8734, MAX8736, MAX8760, MAX8770, MAX8771, MAX8774, MAX8778, PSAL6G2E 2151BCA-T,SC1474, SC1476, SC451, SC452, SC454, SL6266A, SL6559, TPS51620, VT1311, VT451&VT450)

Battery charging chips

(ADP3804, ADP3806, ADP3808, BQ24701, BQ24703, BQ24720, BQ24721, BQ24740,BQ24745, BQ24751, BQ27470ISL6228, ISL6251, ISL6255, ISL6256, ISL88731, LM2601, LM358ADR, ltc1735MAX1535A, MAX1631, MAX1772, MAX1632, MAX1645, MAX1772EEI, MAX1845,MAX1870, MAX1907, MAX1908ETI, MAX1909, MAX1999, MAX8371, MAX8632MAX8724, Max8725, MAX8731, MAX8736ETL, MAX8765, MAX8774GTL, MB3387P, MB3875 MB3887, MB39A119, MB39A126,BQ24703, BQ24721)

Mosfet

( 2951, 4411, 4412, 4413, 4435, 4502, 4503, 4506, 4508, 4684, 4704, 4788, 4802, 4812, 4824, 4835, 4856, 4900, 4856, 4404, 4435, 4800, 4814, 4856, 4825, 4836, 4914, 5130, 6676, 6690, 6900, 6986, 7821, 7832, 9435)

Gallery

Testimonials

Address

BU 1-4, Pooja Arcade,

Motiwala Perfumes lane,

Bhagatalao main road,

Nanvat, Surat 395003,

Gujarat, INDIA (Approx 3.5 km from Station)

Phone: 0261-2424396,

+91-9824144698

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