iPhone 4 mic not working during call
probably this question has been asked many times
here is my problem
i have an iphone 4, during incoming or outgoing call, i can hear other people, but other people can't hear me, i've tried speaker mode,same thing. have not try headphone with mic yet.
i tried to go to camera, and record a short clip, i can hear my own voice though, so it is only happening during calls.
here is what I've tested so far
i have another perfectly working iphone 4, so i began to swapping parts.
first, i swapped the motherboard only, and it seems like it is not the motherboard. because the mic problem iphone motherboard transfer to a good phone, and i can hear people and other can hear me.
and the good iphone motherboard on the bad mic iphone housing still have the mic problem.
my guess i narrowed it down to the housing.
so continued swapping the bottom speaker, bottom mic and charging port, it seems like these parts from bad iphone housing to a good iphone are working.
so it doesn't seem like problem on lower mic and charging port, lower speaker/antenna.
what else should i try?
Is this a good question?