MacBook Pro 820 2936 just stopped working only green light on power cable no fan spin

leonattpcs

New member
No liquid damage, just stopped working, only action is green light
looking for voltages
12.5v is there, but fluctuates between 12.51v - 12.55v
3.42v is there
PP3V3_S5 unstable

PPVRTC unstable

PM_SLP_S4_L - 0v

PP3V3_S5 unstable

PP5V_S5 unstable

PP3V3_S4 unstable

From what it looks like on the schematic, u7200 create 5v and 3.3v
changed u7200, no change
I can't see anything that might be causing the voltages to be unstable, what else could be causing it?
The fluctuations in the 12.5v line?
Thanks
 

JohnB8812

New member
Same as what I said on FaceBook if VCore pulses could me one of many things. If VCore does not pulse, then check all rails for shorts especially PP5v_S3
 
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