iPhone X microphone bad audio after lightning connector assembly repl.

Heyo,

I attempted to repair a colleague’s iPhone X after his lightning port stopped charging. He got quite tired of having to charge wirelessly, so he reached out to me. I successfully replaced the lightning connector assembly, with everything still working.

The next day he texts me about an issue where his call quality for the receiver is terrible and not clear. I took a look at it. maybe I didn’t put in the mic correctly, so I opened it back up and double-checked if everything was in place. I also cleaned the holes a bit just to make sure that isn’t the issue. I also changed a few settings, like the “background noise reduction” etc.

The audio quality was a tiny bit better, but that didn’t fix it.

A few days later he texts again about it. My first thought was to just replace the lightning connector assembly, maybe I just got a faulty one, so I ordered it.

Yesterday I got it replaced successfully once again but still have the mic issues. I have one final idea to fix it. I got my hands on the gaskets (is that what you call them?) that prevent water from coming in. I’ll attempt to replace them tomorrow and keep my fingers crossed that it will fix the issue.

My question is (in case I fail with the gaskets): Do you have any other ideas on how to fix it? Have you ever experienced this problem? (if so, how did you fix it?)

Thanks a lot and stay safe everyone!

-JD