Solution for Nokia 6710s navigator not working upper keypad keys

This solution covers for Nokia 6710 navigator upper keypad keys problem.
If one of the upper keys like "Left, Right, Select, Soft Left, Soft Right, Send and Menu keys" doesn't work or stop responding or working, you may refer this solution below for it shows the connection line paths of the Nokia 6710 upper keypad keys.

Nokia 6710s Upper keypad Solution
If encountered upper keypad keys problem, you may first check the upper keypad board and flex ribbon assembly for possible damaged, just replace if found already damaged.

If after ensuring that the flex and upper keypad board is okay and already tried replacing it with a new replacement spare but doesn't  fix the problem: Try to replace the keypad ESD-EMI filter chip.