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This is nokia 1800 keypad problems solution.You can repair nokia 1800 keypad problem using this solution.
How to do this work : If keypad problem is of your nokia 1800 phone.If you see keypad not work in your phone.Then open your phone and clean full pcb with petrol or thiner goodly next hit with stan light 5-10 minute.Then run your phone see the result.If you see some keypad work and some key not work .Then repair your problem using this picture.