Micromax Q427+ - Not charging; Charging Troubleshooting

Q427+ L3 Service Manual
3. Not charging:
Solution:
 Flash the handset with latest SW
 Plug in the charger to check whether the machine has a charging icon, if don’t have, then check the
5V power pin of USB port connect the mainboard or not
 Check the voltage of battery when charging If it reaches 4.2V, has shown in front of the
Transmission, now maybe is the battery bad so that no charging.
 Check the I/O connector work well or not ,if not , Re-Solder 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 charging switch work well or not ,if not , Re-Solder or change it
 Check the Power IC work normally or not, Re-Solder CPU or change it
 Check the CPU work normally or not. Re-Solder the CPU or change it
I/O
connector
FPC
connector
Main FPC
Power IC
Charging
switch