This is the Nokia E63 solution for Not Working MIC or mouthpiece microphone problem. This solution shows some hints on how to fix the problem.
The Nokia E63 used a five pin digital mic knopfler, unlike the oldest designed which is only analog.
To fix the e63 mic problem, you may locate the mic's circuit and proceed some simple steps like the following below.
1. Try to flash the device to any available flash firmware version.
2. Try to replace the DIGI MIC module.
3. Check the Mic's supply voltage line paths.
4. Check/replace the capacitor and the resistor.
5. Rework the AVILMA IC.