820-00165 Has 1.7V on CPU Vcore. No POST.

[bjf]

I know I've seen this before but I can't remember what causes something like this. Any ideas? The board went through some type of spill but I can't see any signs of it. CPU_VR_EN is normal at 1.05V. PPBUS is at 8.6. I can't find any missing voltages. Not sure where to go next.

 

[JohnB8812]

Tried PRAM reset?

 

[bjf]

Yeah, I tried it, no luck.

 

[dukefawks]

Not much you can do. Check U1900 area and traces to its Xtal. USB mouse lighting up?

 

[bjf]

Yeah, I went through and tested everything around U1900 and U6100. Resoldered and reflowed everything around it to make sure resistors were fully attached. USB mouse is lighting up.

 

[dukefawks]

And you are sure this mouse does not light on a "brain dead" board? Just making sure that we are not chasing the wrong thing here. Could also connect an external keyboard and try PRAM reset and hold down ALT and see if caps lock then works.