Here' the solution that shows the connection line paths of Nokia 6730 classic keypad ESD-EMI filter IC's. Just refer to the image below for it shows how each solder ball bumps being connected with each other, In case you are having trouble in finding the replacements of this said IC's.
There are two keypad filter chips in the circuit board, just managed to reapply the connection line paths as shown on the solution above. This option can help fix the problem just in case if there is no Keypad filter IC is available or having trouble where to find it. However, this does not guaranteed for a quality repair.
Nokia 6730c Keypad EMI-ESD Filter Bypass- Jumper Solution
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