iPhone 5 microphone not working during calls

i change the microphone flex as well as speaker and clean every area. Still it doesn't work, during calls if put on speaker microphone starts work but without speaker phone , other person cant hear my voice. I am suspicious my motherboard have any issue kindly suggest.

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I've been trying too. I have tried every possible DIY ways but i think it's beyond DIY repair & i also think the same, gotta be sth with the logic board - The kind of iphone issues that if u go to apple store they would just replace the phone without telling u what the problem exactly is. Everything's good - speaker phone, siri can hear me no problem, facetime, video recording, voice memo, even when phone call, actually everything is fine, as long as using headset.

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