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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.