820-3115 PP5V_S3 0v

MUUK

Member
820-3115 liquid damage (to usual thunderbolt area and SYS_CLK area).
Green light solid after some work.

When AC power applied fan spins for 3 seconds then goes off then repeats


PPBUS_G3_H 12.56v
ISNSx2 12.6v
PP3V3_S5 3.4v

PP5V_S3 0v
PP5V_S3 diode mode to ground 0.130v (same as donor)


U7200 pin 20/21 0v (occasionally jumps a volt or two)
pin 3 1.9v
pin 1 jumps between 0 and 1.9v
pin 22 4.57v
pin 16 12.56v

replaced U7200, no change.
PM_SLP_S4_L 3.3v when fan spinning then off.

Any ideas please ?
 
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