820-02020 - MacBook Pro M1 2020 - blown UC710 (SN621371)

[ronaldo]

Hi everyone.

This MacBook had liquid damage about 10 months ago.
I've replaced a few components and done U.S cleaning and it is back to life.

So, now it is back to me with no power: TrackPad clicking and a loud fan.
After opening, I found a blown UC710 (SN621371) that I only found the equivalent TPS621351RGXR . It seems to be OK, but still waiting for a few more components to test the mac. And a nice hole on the board. I had to dig in and use a UV mask to isolate after removing the fused shorted layers.

Problem is that one short line remained PP3V3_V2. Leading me to the sense resistor RD810 next to the WIFI/BT module.
Unfortunately, I remove this sense resistor and the short on PP3V3_V2 is gone.
The short now is present on PP3V3_S2_WLBT_ISNS.

Does anyone know if is possible to replace the WIFI/BT module on this model?

Thanks, everyone.

 

[2informaticos]

Nothing to lose, apart of time.
Try to get the chip from donor board, same model.
Possibly married with M1, but the board should boot at least, I suppose.

 

[Panrix Microelectronix]

Hi Ronaldo,

Did you have any luck in replacing the Wifi chip?

I have one with the same line shorted PP3V3_S2_WLBT_ISNS which is coming from the IC. Have tried to replace the chip but it doesn't seem to work. Just wondering if there is a possible repair.

Thanks!

 

[ronaldo]

The short was coming from a cap on the same line, PP3V3_S2 .
After a 2nd full inspection under microscope, I found this crack on the cap,
Replaced and it turned on.
The problem was that the cap was causing the Wi-Fi module to shine under the thermal camera.
After all, I had to replace the Touch Bar flex cable as the fan was full speed even with touch working.