Here’s a solution that may work to solve Nokia Asha 202 keypad malfunction or not responding.
This solution may help as a guide to repair certain keys that does not working when being pressed. If the device suffered wet or water damaged or any means of liquid most oftentimes that keypad may stop working due to some short circuit occurred and or oxidation may build up due to a liquid residues.
If this happens you may need to clean first the keypad membrane and contact pads using a liquid cleaner.
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Solution By d-artigo
There are some factors that this keypad filter IC will breakdown or become faulty due to excessive electrostatic discharge and electromagnetic interference.
Hints for troubleshooting Nokia 202 keypad malfunction:
a) Clean the keypad membrane and contact pads.
b) Check the keypad flex wire if damaged, you may need to replaced the whole keypad flex matrix if the flex is already damaged.
c) Identify which particular keys were not working, then trace its connection between the other keys. If all of the keys connected in the same line paths are not working and the flex is okay, you may then suspects the problem lies on the keypad filter IC.
d) Replace the keypad filter IC Or Make Jumpers.
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Nokia 202 Keypad IC Solution Jumper Problem Ways Keypad Not Working