A phone that no longer holds a charge is indicative of a fault in either the battery or the printed circuit board (PCB board). If the device powers on while plugged in to a working electrical outlet, the battery is likely the issue and should be replaced.
Note: if the device does not power on after being plugged in, the PCB board is likely at fault.
4 
1 
A phone that no longer holds a charge is indicative of a fault in either the battery or the printed circuit board (PCB board). If the device powers on while plugged in to a working electrical outlet, the battery is likely the issue and should be replaced.
Note: if the device does not power on after being plugged in, the PCB board is likely at fault.
John D さんによる