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One day a mobile phone came to me. It was Nokia 1661.When I press power button of that phone there are no response.But When I connect a charger with the phone then charging is ok.Then I understand power button is fail.After that I make this solution.
How to dot his work : Open the keypad sticker check power button if you see power button damage then make this jumper.power button out side is gnd and inside is power button main line.