Micromax Q427+ - Network issue; Network Troubleshooting

Q427+ L3 Service Manual
 Check the RF connector normally or not. Re-sold it or change it
 Strongly solder 26M Crystal or change it
 Check the RF PA normally or not, then Re-Solder RF PA or change it.
 Check the RF IC normally or not, then Re-Solder RF IC or change it.
 Check the CPU work normally or not. Re-Solder the CPU or change it
RF antenna
slot
RF coaxial
RF PA
RF IC
26M