Hi, recently I’ve bought on auction xiaomi poco x3 pro, seller said he checked everything before transport and said microphone was fine and working correctly, as title says my microphone is working properly only when i plug in headphones, otherwise microphone humming and i have to scream to microphone to barely hear my voice.
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Sounds like a bad solder point & that it is rerouting through headphones to get the connection. It could have happened during shipping. If u feel ambitious you can open it and find it to reflow the folder
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@asdasdasd sounds good. Check solder around the plug but also the contact pads/solder points for onboard mic.
Also reseat all cables & ribbons
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