Main microphone-sound really bad
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I tried to fix an iPhone 4 that had a bad sound from its microphone during calls. It´s like a muffled sound, like having your hand in front of your mouth while speaking.
What I did was change the whole dock-connector piece, which has the bottom microphone attached to it. link to part
I thought this would be the answer to the problem, and thought so too after testing it with the SoundRecording-app, where the sound is really good. (from what I have read, this app also uses the second mike on top of the phone, hence the good sound...?)
Then the owner of the iPhone tested it while calling me, and I had trouble hearing what he said.
Any suggestions to what I can do to fix this?
I thought of checking the grill in front of the mike, rinse it if dirty, together with the actual rubber-cover.
Not familiar with the app, but the secondary mic is still suspect. If the sound is suppressed he may be having an issue with it. How is everything else on the phone? Prox sensor ok? Power Button? Was the mic sheath clear of any debris/not folded over or anything?
Check you connections and if everything is else is ok try a restore. Was there any indication of any damage??
9/10 times this program can be fixed by replacing the dock connector. If that doesn't fix it and it's muffled check that the new rubber insert isn't clogged. A good test is using the mic without the rubber attached then with it attached.
Also the mic has double sided tape to adhere it to the rubber if the old adhesive is still inside it could be blocking it.
$12 from www.iphoneparts
I have 3 solutions
this works on Iphone 4
i have tested all 3 of them, and have had success with all 3 solutions..
Iphone 4 lower microphone stops working.
recording video and memos works fine, but people cant hear me during calls.
just to clear things up for everyone...
when using video recording, memos or anthing else that can record your voice, the iphone is using the TOP MICROPHONE.
when calling/getting calls the iphone will be using the LOWER MICROPHONE.
When you put it on "Speaker" then the phone will use both.
Change the Dock Connector
if that wont work... then....
Click on this link, and follow the instructions, on how to fix the Compiler Chip.
sounds and looks wierd...., but yes it works....
done it with multiple phones so far...
if solution 1 does not fix the problem, then solution 2 should help allot.....
should the problem still persist, then you might have a problem with your Home button.
See Solution 3 for more info
Change the Home button.
this last solution was the problem solver for me... i had 7 dock connecters, new and from other broken phones i tested with.
in the end, the home button just gave up when i was swapping around, then i just replaced it, and Voila.... my microphone was working again, and my home button was working too :D
i cant really explain what really happend, but its my 4th iphone i have had these problems with, and all has been repaired with these 3 simple solutions...
i really hope it can help alot of people in here, with issues with iphone 4 microphones not working