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If Nokia 111 keypad is not working you can solve keypad problem in nokia 111 by following these steps that are given in in this post. Look at the diagram bellow and follow these steps.

Keep in mind after dis assembly of Nokia 111 look at the whole mother board for carbon water damages and rust. Make it clean with electronics cleaner and apply heat so that it can be dry smoothly. Do not apply much heat because much heat can harm your skin and may can damage the mother board.
In above diagram you can see a resistance is identified. Remove it and it will solve keypad problem if keys are working duplicate. Nokia 111 keypad problem solution.

f 1,4,7 keys are not working in nokia 110 then you can fix this keypad problem with diagram bellow. In this diagram you can see a capes-tor. This part can become short due to water damages and may cause for nokia 110 keypad problem.

In first step try to make it clean with electronics cleaner and apply hot air so that it can be dry. Do not apply much heat because it can harm your skin and may can damage the mother board.