stuck @ 5V-0.16A - a2780 -820-02652 - macbook pro m2

[JamesGecko]

Hi ,
on a2780 -820-02652 - macbook pro m2
laptops stuck 5V-0.16A with no reboot.
my measurements :
PPBUS_AON 12V
PP3V8_AON 3.8v
PP3V8_AON_MPMU 3.8v
PP1V8_AON 1.8v
PP1V2_AON 1.3v
PP3V3_AON 1.5v not stable
PP3V2_S2 1.5v not stable

On each CD3217:

• LDO 3V3 and LDO 1.5 are OK and stable when I plug the USB on the corresponding CD3217.
• Diode mode : 0.5 on each LDO for all cd3217

PP3V3_AON resistance not stable and not shorted.
I injected 3.3v on PP3V3_AON and consumption was 120mA

PMU (U8100) deliver PP3V3_AON ?
If you have an idea..

 

[2informaticos]

First of all, welcome to the forum!

Any fault history available?

Check all LDOs for MPMU & SPMU; pages 43 & 39.
Don't waste time with the ones marked "NC".

If any missing, check in diode mode also.
Compare readings with good board.

 

[JamesGecko]

i check LDOS on U7700 and find small corrosion on capacitor , just clean and remove a capacitor connect to PP1V5_AON_VCORE_SPMU line , and magic board restart again.
i attach files.
Thanks a lot !