My grandsons A7 microphone level appears to be very low.
Using the sound recorder I have to shout in order to pick up any sound.
other than that just crackles.
I have tried playing with the mic settings in hardware test/audio/normal/mic in engineers mode. no difference,
but not really sure what im doing.
Have opened back but see no obvious problems, mic is hidden anyway
I recently had to resolder 1 usb pin (solder joint had cracked after it was dropped)
BTW, i have one to, great phone:)