Macbook A2338 820-02020 1vS2

[Instafixx]

Device came in stuck at 5V. It had a 3v8_aon short 1 year ago fixed by us.
Now we see C830A is agreen. PP1v2_s2 is shorted. Replaced caps. Device turns on but will only run on a charger.
Before we could check any further the device is now back to 5v and cycling from 0 amp to 0.030 amps.

PPBUS at 12.3V
PP3v8_aon is 3.8v
PP5V_S2 0v No Shorts
PP3V3_S2 is 3V.

Doesnt detect in dfu.

 

[2informaticos]

Post UC300 basic voltages: pins 4, 17, 2, 24.

 

[Instafixx]

4 - 12.2V
2 - 0.20V
17 - 0.006V
24 - 0.03V

 

[2informaticos]

P5VS2_PWR_EN_RC also missing?

1V2_S2 missing/shorted?

 

[Instafixx]

Hi just checked and found PMU_CLK32K_SOC shorted. a small test point near the PPBUS fuse.
Removed R8331 and the short still remains.
BAD CPU ?

 

[2informaticos]

If short remains on CPU side, then is bad.
Possibly leak from PPBUS_AON...