This is the Nokia 3720c solution for not working keypad keys, and this may help to easily fix the phone if the keys doesn't work.
We trace and track down each of the keypad keys connection paths including the volume control (volume up + and volume down -) button switches. Just refer to the solution below and have a look how each certain keys connects.
The keypad EMI filter IC is mounted at the side of the iron shielding braces. You may check and replace it, if the keys stop responding or functioning. The volume control button switches is also associated and connected to other numeric keys, just trace down which key it does being connected.
We trace and track down each of the keypad keys connection paths including the volume control (volume up + and volume down -) button switches. Just refer to the solution below and have a look how each certain keys connects.
Nokia 3720C keypad Jumper Ways Track
The keypad EMI filter IC is mounted at the side of the iron shielding braces. You may check and replace it, if the keys stop responding or functioning. The volume control button switches is also associated and connected to other numeric keys, just trace down which key it does being connected.
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