I just replaced the screen of an otherwise working i5S, and got a crackling/distortion in the earpiece after reassembly. Replaced the earpiece speaker but no change.
Discovered that the sound was fine when the screen was "loose", on top of housing, before pressing it inside the frame. So apparently something is being "jammed" when putting it together.. Cant see anything "abnormal", and have tried cleaning all contacts etc...
What could possibly cause this i wonder..?