820-02100 20V 0A

[ajdoc]

With battery 20V 0A from charger (MagSafe 3got no light, tested on MagSafe and USB C)
PPBUS_AON = 11.05V

Board only:
5V and 0.24A from charger, after few seconds drop to 0.06A.
PPBUS_AON = 11.99V

Diode mode on PPBUS_AON is correct.

PP3V8_AON = 3.79V

Removed F5200 and F5200 and F5201/1 got 12.30V

Any idea what next step?

 

[2informaticos]

Any history available?

Check U8100 and U7700 LDOs.