Whats wrong with my audio only during calls?

I did an entire assembly change and everything works but the audio during calls, I dont know if its the earpiece or the microphone or both, with speaker on, it makes alien sounds/hallway audio/echo n with regular talk ppl can hear me but I cant hear them, what's wrong and how do I fix it?

Answer this question I have this problem too

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Did you ever get answer for this problem?

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