How to replace the mic
when i make a call i can hear their sound but they don't hear mine
Based on the teardown, it seems like most likely the microphone is soldered directly to the motherboard. (Though the teardown doesn't show a good image of the board.) This practice is very common on these kind of phones.
I would recommend cleaning out the microphone hole on the bottom of the phone.
I see this a lot with my customers. We clean speakers, microphones, and charging ports all the time.
I would take a small pin and gently insert it but not too deep (most phones are designed in a way that if you insert something in the microphone hole it won't damage anything, though I am not sure on this phone) to break any dust free. Then blow it out with air. and see if that improves the microphone sound.
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