all but the ok button works ??

Solution
Pop it apart and clean the contacts.

They are pretty easy to get apart and clean.

It probably has tea, coffee, or softdrink between the rubber buttons and the board.

Make sure you clean it with iso propyl alcohol and leave the components to dry properly before reassembling.



Pop it apart and clean the contacts.

They are pretty easy to get apart and clean.

It probably has tea, coffee, or softdrink between the rubber buttons and the board.

Make sure you clean it with iso propyl alcohol and leave the components to dry properly before reassembling.



 
Solution