Apple Macbook Pro / Model A2485 / 20v and .20~.40a on usbc / 28v and .20~.45a on magsafe / no boot /

[zeydullak]

Hello,

We have a Apple MAcbook pro model A2485 that does not boot, no chime, fans dont spin.

There is no visible board damage and client mentioned it just stop working.

What should we start with looking at first.

Regards,
Zeydulla.

 

[2informaticos]

Check PPBUS_AON and 3V8_AON.
If both present and stable, check U8100 & U7700 LDOs.