The phone battery could be low - place phone handset on the charger to charge phone battery.Check battery connection via connection port - See Battery Replacement Guide.If problems persist, replace the battery pack - See Battery Replacement Guide.
Check the back speaker of the phone and its back speaker wire connections - See Back Speaker Replacement guide.If back speaker is dead - replace back speaker - See Back Speaker Replacement guide.
Check to ensure that the phone battery is charged by placing the handset on the phone dock.To clean the main keypad buttons if items cause them to stick or break - See Button Cleaning guide.For problems with the home button, clean or replace the home button - See Home Button Replacement guide.
Check to ensure that the battery is charged by placing the handset on the phone dock. If screen problems persist, replace the circuit board - See Circuit Board Replacement guide.
The volume setting of the phone could be set too low - turn up hearing volume setting on phone.If problems persist, replace the earpiece speaker - See Earpiece Replacement guide.
The phone could be set on mute - turn off mute button using keypad.Check wiring connections for microphone - See Circuit Board Replacement Replacement guide..If problems persist, replace the circuit board which has the microphone soldered on - See Circuit Board Replacement Replacement guide.
If problems continue, consider replacing circuit board - See Circuit Board Replacement guide.
