Here's a Nokia 6720 classic solution for keypad not working problem. This solution may help to fix a non responsive keypad keys.
In Nokia 6720c, the keypad connection is being assembled on a flex matrix, checking the keypad flex ribbon for possible damaged may done first. If the keypad flex ribbon seems working but still some of the keypad keys doesn't work, you may then refer to the solution below to locate the keypad filter IC.
The keypad filter IC is mounted just near the keypad pin connector. You may then try to replace this said filter IC for possible damaged. You may also trace each of corresponding connection line paths for further troubleshooting.
In Nokia 6720c, the keypad connection is being assembled on a flex matrix, checking the keypad flex ribbon for possible damaged may done first. If the keypad flex ribbon seems working but still some of the keypad keys doesn't work, you may then refer to the solution below to locate the keypad filter IC.
Nokia 6720c keypad filter IC jumper ways
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