Macbook Pro A2442 (820-02098) Stuck at 5V

[Instafixx]

Ordered myself a Thermal Camera. UG800 was heating up.
Removed that and the short is gone.

This is a relatively new board. Where to find this part? Which boards?
M1 Air and Pro.

i think U9580 from A2141 (820-01700) should work ?

 

[2informaticos]

Yes, it works.
Is also used on 3V3_G3H_RTC power supply.

 

[Instafixx]

PPBUS no longer shorted. But machine is still stuck at 5V.

PPBUS with Fuse is 1.6V.

 

[2informaticos]

Diode mode to ground at PPBUS_AON?
Compare with the readings on all big coils; including LG800.

 

[Instafixx]

LG800 is shorted .
.003 on both sides

 

[2informaticos]

No short on PPBUS_AON?

Lift LG800/1 and check if short remains on pad 2.

 

[Instafixx]

Yes short remain on Pad 2 after removing LG800

 

[2informaticos]

Who do you want to lift LG801???
Don't you read my post?

 

[Instafixx]

Yes sir. Lifted Both. Typing Error.

Short Still there. Should we inject voltage?

 

[2informaticos]

Start with just 1V; don't inject more than 5.5V there.
Thermal camera may help you to find the culprit with lower voltage.

 

[Instafixx]

UG400 getting very hot.
Needed 2V to find the culprit

 

[Instafixx]

Replaced UG400. All short Gone.
But when i plug in from the corresponding port PPBUS is stuck at 1.2V. Whereas if i power up from the other C port it is going upto 12V. (Fuses Removed)

Is the CD3217 bad or there is some other issue? How can i confirm before replacing it with another?

 

[Instafixx]

I changed another CD3217 from the same donor board. Now getting even lesser voltage 0.3V.

Please guide

 

[2informaticos]

Did you take CD3217 chip from same donor model board and same position (in the board)?

 

[Instafixx]

Not the same model but the IC number matches.

 

[2informaticos]

Try again, with exact same model donor board.

 

[Instafixx]

Its a very new model. Tought o find the same model donor board.

 

[Instafixx]

Hi,
Please help. tried another IC as well. Didnt work.
Suspecting some other issue.Please guide

 

[2informaticos]

CD3217 chips replacement generates lot of problems on the new models.
Ypu should get them from exact same model donor board, maintaining the same position.

Just in case, try replacing the corresponding TBT ROM too.
Should be good to make backup of both ROM chips.

 

[Instafixx]

Let me try and find the same model.
If not is there any way to bypass it? Customer is okay with not using 1 port.