Macbook Air 2020 (a2179) - touch id not working

[obelix24]

Hi i have one Macbook Air 2020 where touch ID is not working (it's not scanning fingerprints). Touch ID was working before, there is no error message during scanning fingerprint it's just not scanning on screen you can see only fingerprint but there are no red updates as when it's working. Power button is working fine.

I've checked boardview and also schematics but i'm not able to find anything related to TouchID ... i have similar issue on a2338 where there was problem with PP3V0_TOUCHID and after replacing UT610 it was working but here i'm not able to find anything related to TouchID is it fully operated by audio board ?

[obelix24]

any idea ?

[mon2]

See if this helps (assuming it is not a hardware failure):

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

[obelix24]

this is not my case as i don't have fingerprints there. when i click on add fingerprint it normally opens window with scanning but it doesn't scan my fingerprint. it's not recognizing my finger on the button itself. so to me it looks like hardware issue somewhere on the board but as i'm not able to find any traces for touch i don't know where to measure.

[mon2]

How did this unit go from working to a non-working state?

[obelix24]

there was water damage in audio board so i replaced it with another one and it was working some time and then it stopped (touch id) power button is responding only issue is the touch id. I'm trying to find any schematics for this audio board but nothing online