Problem: Nokia N900 Keypad Problem, Keypad Failure or Some Keys Not Working.
Solution: To solve this problem first disasseble mobile and cleand keypad and motherboard with ctc and apply normal heat.In case of keypad ic problem then change keypad ic simply.Here i attack a diagram to trace keypad ic in nokiaNokia N900 motherboard.
Nokia n900 keypad problem solution
Nokia N900 Keypad IC

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