Micromax Q427+ - MIC no sound; MIC No Sound Troubleshooting

Q427+ L3 Service Manual
11. MIC no sound:
Solution:
 Flash the handset with latest SW
 Check the MIC bad or not. then Re-Solder MIC or change it
 Check the connection of main board and vice board normally or not.
 Check Earphone connector also , If Earphone connector got shorted : MIC & Receiver will not work
 Check the MIC work normally or not , Re-Solder the MIC or change it.
 Check the Main FPC Assembly Quality , if not ,Re-Assembly it or change it.
 Check the FPC connector soldering Quality , if not ,Re-sold it or change it.
 Check the power IC work normally or not. Re-Solder the power IC or change it
 Check the CPU work normally or not. Re-Solder the CPU or change it
MIC
Main FPC