820-3332 fans spin fast for 2secs then go off and cycle

PhilipC

New member
Previously worked on machine, notes from previous repair shop "battery not detected, replaced ISL and reflow SMC"
When it got here not even a green light, replaced SMC and ISL then G3H was measuring 1.3v with 8.9ohm to gnd short and GPU was getting hot.
Q8930, Q7550, Q7510 looked rusty so replaced and now get 12.53v on G3H and the fan near the GPU spins at full speed instantly for about 2seconds then goes off and will cycle after about 6secs. Cpu_vcore comes up to 1v for the 2secs that the fan spins
 

dukefawks

Administrator
GPU was probably fucked by shorted high side FET. Also should replace the buck controller for GPU Vcore if one of the FETs was shorted.
 
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