Micromax Q427+ - Receiver not working; Receiver Troubleshooting

Q427+ L3 Service Manual
12. Receiver not working:
Solution:
 Flash the handset with latest SW
 Check the receiver bad or not, then change it.
 Check the receiver circuit normally or not.
 Check Earphone connector also , If Earphone connector got shorted : MIC & Receiver will not work
 Check the Power IC work normally or not. Re-Solder the Power IC or change it
 Check the CPU normally or not, then Re-Solder CPU or change it.
Receiver
Slot
CPU
Power IC