Burnt Hole under IC on MacBook Pro M1 Pro 14"

[silberdrache]

Hello,
I'm new to this Forum, so I hope it's the right place for this topic.
Im a student from germany, and as a hobby I repair electronics. I started microsoldering maybe 1-2 years ago.
I have a MacBook Pro 14" m1 Pro with 10 Cores and 16/1tb storage. The board Number is 820-02098-A.
The MacBook has a light water damage. Coffee got spilled over it, but the Mac continued working only the battery didn't charge anymore and when the battery was empty the Mac turned off and doesn't show any sign of life now.
I opened it up and there were only three drops of coffee on the board. One was near the hdmi port, and it didn't seem to affect anything (I don't have a picture of this one). I added images of the other two (I hope the quality is good enough, I don't have a camera for my microscope yet)
One is on the UG800, the other one near the QP800.
I cleaned the spots with IPA and an old toothbrush and tried to start the MacBook. But it only took 5V and didn't start up.
So i checked the spots again and saw that there was a small hole next to one of the Chips (labeled UG800 on the board view)I desoldered it. It appears to be a Voltage transformer, a TPS62180. And under three of the pins (PPVIN_5VUSBC23_ISNS) there is a burn-hole in the PCB. I attached an image. It appears to have traversed one layer and destroyed the layer underneath in this point. It looks like the coffee has shorted ground to the input and burnt these holes. In the schematics this chip is marked as 'Critical'. Do you think theory is true?
Do you think this chip is the problem for the mac not starting up? And ist his hole still repairable? How would I do this? It's my first time having a hole in a pcb...
And as a general question, because there are a lot of opinions on the Internet: Should you use an ultrasonic cleaner to clean water damage (in this case)?
Thanks for all of your answers!8

[mon2]

For sure clean up all areas of the liquid damage / green pond scum.

Gently scrape the ball that appears to be burnt so that you have apply a bit of solder to complete the connections with the WLCSP packaged TPS62180. That is, when you apply a fresh regulator, its ball should ideally mate with the same target pad. You may be lucky here since the entire vertical row is common bussed. Most likely the same on the actual part itself so you may not even need for these 2 balls to be connected. Best if you do but should work, in theory as-is with a fresh part.

This event most likely killed the SSD devices. Watch the linked videos on this topic. I was in Shenzhen a few weeks ago and met with JCID and they noted that this root cause can now be fixed with fresh SSD devices (after programming with their jig) + new TPS62180.

Historically, this event would cause the motherboard to die without repair. A very common fault with this model.

https://www.youtube.com/watch?v=7cNg_ifibCQ

https://www.youtube.com/watch?v=CAGnMR1aVuE

[silberdrache]

Thanks for the answer, i will do it later.
I tested one more thing, hte pins are shorted to ground. Also the line of pins next to the affected ones (..._SW1, ..._SW2)

[mon2]

If you study the datasheet from TI for the same part, the same pins should also be in a common bus. I think you will be fine here to just replace the part. Do inspect the target SSD devices and test their resistance to ground. That is, if this regulator blew up and allow for the high side mosfet to leak and supply the high voltage directly to the SSD (as per the shared videos) then the target SSD will very likely be damaged and with a pimple or hole on the die of the package. That is, the SSD must also be replaced. You can purchase pre-flashed / configured SSD from Aliexpress or use the P15 programmer from JCID to do the same using a blank IC.

[silberdrache]

OK, I dont understand why the SSD should have a damage? The lines from the UG800 don't go to the SSDs as far as i've seen it? But the point to check the other components was a good one, the charging IC UG400 has a burn hole in it, like you mentioned it. Thats the IC the lines go to, a CD3217B12BCE.
I will try to desolder it and check if the lines are still shorted to ground.

[silberdrache]

I desoldered the charging IC and the short from the _SW1 and _SW2 pads are gone. But the _ISNS pads are still shorted to ground. Could this be because of the burn hole? Or ist this normal?
Also i cleande the area, this is what it looks like. I ordered a new part from aliexpress, i hope it arrives in a week
FEF