Nexus 7 (2013) microphone replacement -
For anyone who might have stumbled upon this while looking for a solution to this problem - the microphone is an integral part of the power/volume button cable assembly (black 4x5mm rectangle on the end).
Once the device is opened up (which may or may not be easy and may have contributed to damaging the mic in the first place), replacement of that full cable assembly (typically <$10) is very simple. No soldering required. It is held in place by adhesive and electrically connected via a latchable ZIF socket that the small ribbon cable end slips into.
My mic was fine before I replaced the screen, but unusably weak afterwards - only functional by shouting directly into it. Replacement of the cable assembly as described here fixed the problem.
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