820-02020 no power, PPBUS low

[Pavel]

Hello!
Macbook Pro 13 A2338 , Board 820-02020 no power, no liquid damaged, like new!

Look on the charger is 5,2V 0,46A on both ports

PPBUS_AON is 7,4v

U5200 is ok, I've changed it.

Any idea?

 

[2informaticos]

First of all, welcome to the forum!

"PPBUS_AON is 7,4"
With, or without battery connected?

Do you get 3V8_AON?

 

[Pavel]

Thank you! )))
PP3v8_AON is 3,45v

 

[2informaticos]

Please, reply to the first question too.

 

[Pavel]

Oh! Sorry ))
PPBUS_AON is 7,4 with and without battery

 

[Pavel]

And I have just 8 ohm on L5800/L5820/L5840 in diode mode
It is PP3v8_AON rail

 

[2informaticos]

Remove F5200 and check C5250 voltage.

Compare diode mode readings with good board.
Or use reference table:

OpenBoardData Project

 

[Pavel]

Hi!
I've removed the F5200 and voltage is 12,29v on C5250
Also, I have shortage on PP3v8_AON, 8 ohm in both sides on L5800/L5820/L5840 or C5890/C5891/C5892/C5893 and C5894
I had injected 3 volts on C5890 and saw that U7700 got hotter ...

What do you think ? I must changed the U7700? It is PMIC APL1097

 

[2informaticos]

You should change it.
Once removed, check if diode mode reading goes high enough.

BTW, PMUs from 14" and 16" M1 are interchangeable.

 

[Pavel]

Thank you ! I will order it, I don't have.
APL1097 343S00440