Micromax Q427+ - Speaker not working; Speaker Troubleshooting

Q427+ L3 Service Manual
13. Speaker not working:
Solution:
 Flash the handset with latest SW
 Check the Speaker bad or not, else change it.
 Check Earphone connector also , If Earphone connector got shorted : MIC & Receiver will not work
 Check the SPK FPC soldering quality , if not ,Re-sold it 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
SPK contact
Main FPC