Here's The solution for Nokia E5 keypad malfunction. This is very useful
in troubleshooting certain keys that won't work or not responding due
to wet damaged. This solution completely shows each corresponding keys
line paths and connection including the keypad filter IC.
Nokia E5 keypad failure solution - keypad filter IC jumper ways
There
are two EMI filter chip is being used in the circuit and it is located
near the battery terminal. This keypad filter can't be found from old
Nokia models.
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