In above diagram there are two main dial ic these are used for keypad functions and these are controlling keypad opetions.in upcoming days I will add a post about keypad track of nokia asha 200 that will also help you to see that which keys are linked with each other.
For this post you only can clean the board ic and keypad if there is some rust or carbon. you can resold these two parts and can replace these two ic for keypad problem in nokia asha 200.
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