Postagem original de: Clint Eastwoodstein ,
Might not be the logic board. That ribbon cable is fickle. I ahd this problem and just bought the cable (proximity sensor cable) off of amazon and replaced it. There's a youtube video on how to do it (since it's not immediately obvious), and it's an easy repair. Also, remember to always shut off your phone before you open it. Seems that the proximity sensor or the cable may be especially sensitive to that.