Dell Precision 7510 intermittent POST failure

[peterzz2007]

Hello all,

i have troubles with Dell Precision 7510 board LA-C541P Rev:2.0 A01.

It didn`t POST and it`s throwing 2amber and 1white code which is CPU failure.

Sometimes it`s just start working when disassembled and put back again,but with a lot of BSOD when i tried to install W10,sometimes it is working completelly fine unless switched off.

I tried to make some pressure on CPU BGA socket,but no change of behavior.

BIOS has been programmed,also BIOS chip was changed and still nothing.

Not working board just sit for a day or two and when i plug it,it just pass POST and it starts!

Any ideas please?

[mcplslg123]

Re: Dell Precision 7510 intermittent POST failure

Sounds like SOC issue??

[peterzz2007]

Re: Dell Precision 7510 intermittent POST failure

Sorry for late reply,still trying to manage what to do with it...

Now it just sat for 2 weeks in shelf with other 3 laptops on top and it is working again.

But when i try to connect with internal wifi it freeze the system almost completely...
Without wifi connected works fine.

Any clues please?

[peterzz2007]

Re: Dell Precision 7510 intermittent POST failure

So it is probably PCH problem,problems occur on PCI-E and SATA devices..

[mcplslg123]

Re: Dell Precision 7510 intermittent POST failure

Thats what i wrote in post#2

[peterzz2007]

Re: Dell Precision 7510 intermittent POST failure

Yes,thank you,you had a point.

[peterzz2007]

Re: Dell Precision 7510 intermittent POST failure

Hello all,still trying to make this machine work.
I bought dead board where i found shorted high side mosfet on 1.2V RAM power rail.
Mosfet removed and replaced,but there is very low resistance (about 5 Ohms,on good board is about 400) on rail leading to memory controller/cpu.
On RAM power rail there are kOhms now (i removed solder from jumpers to measure power and controller side separatelly).
Board power LED just blinks for a second and went off.
Did i missed something or is it game over (dead memory controller/cpu)?