オリジナル投稿者： Minho ,
I don’t really understand why you reballed and replaced Homer and M2800 as they have nothing to do with TouchID. Homer is involved with the Taptic engine and M2800 are just coils for the backlight, Arc driver, Tigris and SpeakerAmp. As for U4805, it is a [http://www.ti.com/lit/ds/symlink/sn74lvc1g3157.pdf|switch] so it is possible that you reading an open circuit was due to this switch being open. Is the problem with TouchID, as in it won’t recognize the fingerprint reader or is it a laggy button or erratic operation? Those symptoms can be caused by the Audio IC. If the audio problems are resolved, then you have a separate issue but there isn’t much you can do to fix TouchID.