820-2915 12V dropping issue.

ALB-Repairs

Member
HI
Im working on a 2915 that had heavy liquid damaged, ive done a lot of rework, Ive got it to the point where it chimes and remains on in SMC bypass.

Now when its not in SMC bypass the system does spin the fans, but only when 12V is high, it often drops to about 3V then goes back to 12V. It seems like the SMC is turning the ISL6259 off for some reason.
Ive already replaced the ISL6259, The SMC, check all current sensing around the ISL6259.ect and have had no symtom changes atall.

Any help would be appreciated.
 

ALB-Repairs

Member
As stated above i have checked the ISL's current sensing. They are all correct. ive had a look at it under the micrsocope, all the traces are intact.
 

ALB-Repairs

Member
Thanks duke, there was a tiny trace break on pin 17. Dont usualy miss things like that.

Typically this board is still a pain in the ass. Its now posting but with a messed up screen, It boots though, im fairly sure the GMUX has failed. Just my luck.
 
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