オリジナル投稿者： Minho ,
What happened in the days leading up to this issue; was the phone dropped, repaired or came into contact with water? This could be as simple as a bad battery (although iFixit batteries are usually very good) or it could be a logic board issue. You could try disconnecting the screen and cameras from the logic board (battery first!), leaving only the board, dock flex and battery and then see if the phone will be recognized by an iTunes enabled computer. If it doesn’t see the phone, then it is most likely a logic board issue. If the phone does boot, then add one flex at a time until it stops working to determine the faulty part (again, always disconnect the battery).