820-02098 stuck on 5V

[bjf]

This had liquid-damage. After cleaning it, it worked fine but the front left USB was stuck at 5V. The computer worked fine for about a year and now all the USB ports are stuck at 5V. I'm posting pre-cleaning pictures. Any thoughts?

PP3V8_AON is at 0V
PP3V8_AON diode is at 0.180
PPBUS_AON is normal at 12.3V

 

[2informaticos]

Compare diode mode reading at 3V8_AON with good board.
I think should be higher...

 

[bjf]

Hi, yes, it's supposed to be around .360. I'm trying to find the source of the short but can't figure it out.

 

[bjf]

Any thoughts on how I might find this short? I don't think injecting voltage is going to help being that it's not much of a short.