The solution below shows the complete line paths of Nokia X3-02 keypad filter IC, which can be used as a guide to mend or apply an alternative solution to temporarily reconnect or jumper the solder ball bumps of the keypad filter IC.
Nokia X3-02 keypad filter IC Jumper Ways
Just refer to the solution above for tracing the keypad connection line paths.For a complete Nokia X3-02 keypad not working troubleshooting solution see here.