[SOLVED]820-2936 White Screen, No Booting

[computercaverva]

No signs or water damage, the back story we were told was that it went through a power surge and then wouldn't turn on again. Gets all power rails except PPVCORE_S0_CPU is only 0.86 instead of the 1.25V noted in the schematic. After noticing this I found that the capacitors on the PPVCORE rail right above the PCH are all shorted to ground. I have removed Q7510 and Q7520 and the short is stil present, should I just start popping of caps until the short goes away, or is it most likely a shorted CPU?

 

[larossmann]

0.86v is fine for CPU vcore. Also the capacitors above the PCH are not shorted to ground. Read this post and tell me why. https://www.rossmanngroup.com/board...ing/22084-3332-ppbus_g3h-7v?p=24887#post24887

Does this beep with no RAM installed?

 

[computercaverva]

OHH (face palm) that makes sense the low resistance gives the symptoms of a short. Wont make that mistake again! It does beep once repeatedly with no RAM installed.

 

[aprendiz]

Does it chime???, Image on external?? PRAM reset??

 

[computercaverva]

It does PRAM reset, chimes, SMC resets, no image on external display either, when I use a USB bootable ASD drive the drive lights flash as it tries to initiate and then loops the same flash cycle over and over.

 

[dukefawks]

3V present on C9015?

 

[computercaverva]

No Title

Thanks Duke! I think I might have found something a little screwy, I will replace these components and check back in hopefully with an all fixed!

 

[computercaverva]

We can mark this one resolved!