MacBook A2141 one USB port dead and one power cycling

[dbuergi]

Hi all,

I got a 16inch MacBook Pro showing 5v and 0,3a on the left ports and right side has one power cycling and one showing nothing. The one cycling shows 30c under thermal camera. Surrounding components show no corrosion or any shorts.
Any ideas what to check next? The whole board looks clean compared to the other A2141s i saw.

[mon2]

See attached. You are at the power sequence #1 stage.

Remove all power. What is the resistance to ground of PPDCIN_G3H? Issue is most likely with one or more of the CD3217 PD controllers.

[dbuergi]

See attached. You are at the power sequence #1 stage.

Remove all power. What is the resistance to ground of PPDCIN_G3H?

Resistance to ground is 955 Ohm.

[mon2]

This may be your case study:

https://repair.wiki/w/MacBook_Pro_A2...w_at_5V_repair

[dbuergi]

I replaced one cap and gave both CD3217 on the right side a reflow. Now all ports show 5V and 0,17A. Also no difference with battery connected so next step should be to try a DFU restore?

[dbuergi]

Sorry was not able to edit but i made a mistake. 3 Ports Show 5V and 0,2A and one 5V and 0,12A.
With battery connected three ports show 20V and the one stays at 5V and 0,12A. So still problems with the Cd3217 of this port?

[mon2]

Use the port that allows for 20v for now. What is the volt to ground on PPBUS_G3H?

[dbuergi]

Use the port that allows for 20v for now. What is the volt to ground on PPBUS_G3H?

12,3v and cycling to 11,6v and going back to 12,3 again.

[mon2]

Test the nand flash capacitor to see if it is shorted.

reference:
https://repair.wiki/w/MacBook_Pro_A2..._at_20V_repair

No power to the board when testing the resistance to ground.

[dbuergi]

Test the nand flash capacitor to see if it is shorted.

reference:
https://repair.wiki/w/MacBook_Pro_A2..._at_20V_repair

No power to the board when testing the resistance to ground.

Sorry was busy the last days. Cap and everything around is fine and somehow my 5v port is now dead again and all others show 5v.
The one marked with X isn't showing anything right now. I added values i got when connecting power to the other port.
Can this all be the problem of a faulty UB300 or do i have to look anywhere else?