82-3115-b

board has no liquid damage. one cap (c4705) burned up and pad was missing. ran a trace to fix the connection. I get green light. but it flickers. I also notice that u1800 is getting pretty warm. is the cpu/mxu dead?

pp3v42 -3.47v
ppbus - 1.7

is this a usual problem for this board or should i just inject voltage and see what happens?
 

JohnB8812

New member
That is definitely a short. Remove F7140 and see if pin 1 or 2 measures low resistance. If pin 2, inject 1 volt at first. If the PCH gets hot, this is fucked.
 
removed f7040. pin 2 is shorted to ground. 11.8 ohms. i put 1v and 1amp on it and the pch does not even get warm. tried up to 3v 1 amp and nothing is getting warm. tried the alcohol test.
 

JohnB8812

New member
If the PCH is not getting hot, you are going to be ok more than likely. Put 5 volts at 4 amps and see what gets hot.
 
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