820-3437 Missing PM_SLP_SUS_L.

[SMMRepair]

Working on a board that had liquid damage, and after replacing all questionable components, board had ppbus_g3h at .5v. Found the board had a shorted Q7320. Replaced Q7320 and Q7321, and the short is now gone and I have a good 8.56v on ppbus_g3h, but I'm missing PM_SLP_SUS_L. PM_DSW_PWRGD is present, but PM_SLP_SUS_L and all my sustain signals are not present. No shorts found. U8020 is covered in that protective conformal coating, and I didn't try replacing it yet, but if worth a try I will. I just figured since the liquid went near the CPU and shorted that MOSFET, that my CPU may be toast.

Should I waste any more time on this?

 

[dukefawks]

Q7320 was shorted so that is pretty much end of the line. The SUS_L issue is probably something else, but the risk of dead CPU is too big to invest time in this board.

 

[SMMRepair]

Thanks, duke. I figured as much, but like to run things by you.

I actually need more 3437 parts boards, so not a big deal. Thanks!