cannot get the mic working.
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the proximity light sensor has a little cover on the front and most replacements won't come with this so you need to take the one off of your existing sensor, if you don't it won't work.
I too am having problems getting a mic to work after another "iPhone repair man" had his hands on the phone, the phone was taken to him as the earpiece speaker wasn't working right (I sorted this with a hard reset) he had replaced the bottom mic for some reason and even with trying the board in a fully tested and working handset I still HELP ME PLEASE