원문 게시자: Rainfellow ,
There are 2 different mics in the iPhone, One on the bottom for voice memo and calls, the other on the top near the headphone jack for videos. THe one that is not working is mart of the charging port assembly. You would need to take the phone apart and make sure there isn't any liquid damage on or around the charger port connector on the main board. If not, then I would suspect the charger port it'self. Once this is replaced with a new on you should be good to go.