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If you have had no problems with the mic prior to an operation on the phone that requires opening up the device, but problems appear right after, chances are, a mistake was made at some point.

For Xperia Z series it seems to be a common problem that upon screen replacement the microphone goes mute. And the culprit is almost always the flex cable. Even experienced people make mistakes sometimes, and flex damage is a very common thing to go wrong during the screen replacement. And that is what this guide is about.

Other possibilities include

A surface-mount component has been knocked off the board or on the flex.

There is dirt or a bad connection between the flex and the motherboard, or between the part and the flex.

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