Nokia 1680c-2 keypad 1,4,7,* Keypad Not Working Solution By IC Jumpering
Nokia 1680c-2 keypad 1,4,7,* Keypad Problem Solution
Solution:
Change Keypad IC If Problem Not Solved Then Make Jumper Like Diagram.

Nokia 1680 Keypad IC Jumper Diagram

Nokia 1680c Keypad ic Jumper

Nokia 1680 Some Keys Not Working Solution 

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