A2338 - 820-02773 No power. Stuck on 5V.

[ronaldo]

Hi, everyone.
I need some help, please.

This Macbook came in with no power. After inspection I found
Liquid damage, corrosion near USB C controller (CF300)
Both ports were initially stuck on 5V

Replaced the USB C controller that is stuck on 5V, no difference.
Replaced the second USB-C controller, no difference
ISL9240 was replaced and is still the same.

Both USB-C ports are stuck on 5V and 0.3amp for 3 sec and drop to 0.02amp.
Measurements around controllers match with a good board.

I can't think of the next step. Please help.

 

[2informaticos]

Did you get the CD3217 chips from donor, same model board?
Did you maintain same position of them?

 

[ronaldo]

I got it from an M2 Air, not the same board.
Not the same position.

 

[2informaticos]

Get correct donor board.

 

[ronaldo]

Do you think that CD3217 from M1820-02020 is compatible with the M2 820-02773 board?

 

[ronaldo]

I did replace from a M1 pro board and now one port is getting 20V and cycling and the other one is still stuck on 5V.

 

[ronaldo]

Here is the thermal image if the charger is connected to the 20V cycling port.

 

[2informaticos]

So you've replaced both chips from donor board same model, maintaining their position on the MLB?

Usually cycling port is trying to boot, so problem should be on the other port.

 

[ronaldo]

I replaced the chip from M1 Pro and the board is from M2 pro.
Maintaining the same position.

 

[2informaticos]

No guarantee to work properly.
Get the chips as above explained.

 

[ronaldo]

I got a donor board with the same model and replaced the USB-C controllers in the same position.

One port was still stuck at 5V, and the other port was cycling at 20V.

Upon further investigation, I found no connection between pin 12 on UF300 and CF300.
Basically, UF300 wasn't getting PP3V3_UPC0_LDO

I jumped the wire, and now both ports are at 20V, but they are still cycling.

 

[2informaticos]

Cycling rapidly, or 10-20s?

 

[ronaldo]

Every 2 to 3 secs.

 

[2informaticos]

Check all secondary power supplies for voltage pulse, or short.