Dell laptop with power problem

[emmanuelbill1988]

please I really need urgent help,I have this dell laptop board with power problem,when i put the charger in the power jack the charger light goes off,i checked if there is a burst in the caps but I couldn't see any and i decided to change this Ic's
PQ0100
PQ101
PQ110
PQ108
PQ102
PQ704
PQ702
PQ703
PQ300
PQ204
PQ205
PQ203
PQ500
PQ501
PQ701
PQ700
after changing them still the problem is not solved, can someone please help me with what i should do next,the board number is LA-9104P Rev:1.0(A00)tnx in advance

[emmanuelbill1988]

Re: Dell laptop with power problem

And i put my multimeter on buzzer and check the positive lines it beep without the charger plugged inn which means there is a spoilt component but I can't find it,please someone should help me out

[polytek]

Re: Dell laptop with power problem

please post your mobo code, sorry i see it now

[emmanuelbill1988]

Re: Dell laptop with power problem

mobo number is LA-9104P Rev:1.0(A00),please need help seriously

[piernov]

Re: Dell laptop with power problem

Are you serious? We already answered that on your other thread and you open a new one without even bothering answering us?
https://www.badcaps.net/forum/showthread.php?t=62131

And you swap component randomly without even trying to think for yourself…
We still need to know what resistance do you get.

Anyway, when you've got a short on some line, one method to find the faulty component is to put some voltage on it using a lab power supply. Start with 1V and check if anything gets hot, especially CPU, GPU and PCH and check the current drawn. We will go from there…

[emmanuelbill1988]

Re: Dell laptop with power problem

all the components on the board reads like a fuse or PL so I don't know which one maybe causing the GND problem

[polytek]

Re: Dell laptop with power problem

http://www.zupimages.net/viewer.php?id=17/20/xape.jpg

[emmanuelbill1988]

Re: Dell laptop with power problem

polytek I have removed the solder PJ and checked caps but still

[raajkumar]

Re: Dell laptop with power problem

Same problem happen to me. I inject 1v power on 3V line and i found KB chip came hot. I replaced it the problem solved. You try to inject like that first you should remove Supply coils.

[mcplslg123]

Re: Dell laptop with power problem

Open all the jumpers and see which side of jumper is shorted and then trace that line to find faulty componenet. No need to change all the componenets randomly-the mobo may get damaged rather.

[emmanuelbill1988]

Re: Dell laptop with power problem

tnx very much guys,the board is working perfectly now,i opened jumper PJP500 but still there was a short on the mono and all I did was to give the board a 20v charger,after few seconds I release the two caps closer to PJP500 one was smoking,so I changed it and now board is working,I have really learnt a lot in this forum,Bless you all and especially Polytek for helping