Chosen Solution
Hi Guys, this is the second time this has happened to me, I changed the charging port on a Galaxy s3 i9300 which went well, I re-soldered a new charging port onto the mother board using my scope and checked visually and with my meter to ensure there were no shorts between the contacts, tested the phones functions and everything worked perfectly. However; within 24h the client has informed me the mic has stopped working and during calls the other person can’t hear them speaking. I’ve seen this happen before and can see on various forums that this is common issue, but haven’t found an explication as the why this would happen or what has caused this? My suspicion is that somehow I’ve damaged an ic chip during the removal of the charging port.. Any help or advise would be much appreciated or some links to where I could find some circuit diagrams so I could do some fault checking.. Thanks in advance Paul iFixPhonesUK
Well guys.. It wasn’t the ic chip.. After replacing the mic a third time I still had no sound, but if you blew across the mic it you could hear the wind, but still wouldn’t pick up sound from voice which me think the it was a faulty mic, so I replaced it a fourth time ensuring that the board was at the melting point of the solder just before placing the mic, and a very quick blast of heat fixed the mic in place.. and this time it worked!! So turns out that the mic’s are very sensitive to too much heat and possibly flux as well.. Thanks for you advise guys, much appreciated
It’s probably the mic itself. The mic is very close to the charging port so it’s possible that you damaged it when you replaced the charging port. Just replace the mic and you’ll be good.
well!! u need to be carefull when u replacing the mic our usb port on s3 or chager port dont use more then 290 :)
This has happened to me too several times. Even after changing the mic, the mic did not work only picking up noisy sounds. I was fed up and had to get a new daughter board which solved the problem.
