Here's a solution that may help fix and repair Nokia N78 keypad failure or malfunction.
If you already tried to replace the keypad flex cable but the problem
still exists, this solution below will show you the keypad filter IC
that is being connected to eah particular keys within the keypad matrix.
Nokia 2710NE Memory Card Solution - MicroSD Card not detected problem repair solution
Nokia 2710NE Memory Card Solution - MicroSD Card not detected problem repair solution
N78 Keypad Filter IC connection tracks
You may trace each particular line paths for deep keypad repair troubleshooting.
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