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Here's a full keypad solution that may useful and possibly help fix and repair Nokia N92 keypad problem or failure. If any certain keys will not been able to function this solution will show you each keypad keys line tracks and connections, including the keypad filter IC that may also cause the keypad keys failed to function if damaged or faulty.

Nokia N92 Keypad Keys Malfunction Solution

 Nokia N92 keypad IC jumper ways

There are two keypad ESD filter is being used on the keypad circuit of Nokia N92, (see solution above).
The small keypad IC holds the volume UP and DOWN control and the Camera Shutter button, and some  group of keys.
The bigger one holds all the keypad keys, if this keypad filter IC is damaged all of the key will not respond or unable to function. By only replacing it with a new one will only possibly fix or repair the keypad problem on Nokia N92.