Changed screen - now the mic's not working on calls
I'm fixing my friend's phone. I changed the broken screen, and for that I had to remove some connections and parts related to the mic. Now the phone works well otherwise, and even the mic works while using video camera, video calls and such, but on normal calls it's completely mute.
Now there's few questions that pop in my head. Like, is there two mics, one for video calls, and one for normal calls? If yes, then the other mic could either be broken or not connected. Or which connections inside the phone are for the mic/mics specifically, so I could check them out.
I don't know if this has anything to do with my problem, but it would seem, that while I glued in the new screen, I forgot to remove a cover plastic from the other side. As far as I can guess, it only affects the cooling properties a bit. But there was plastic in the mic hole, and I removed it. Didn't work though.
So if you guys have any suggestions, please shoot. Thanks.