Use a Q-Tip ''lightly moistened'' (not dripping wet) with Isopropyl Alcohol 99%+ (available at electronics parts stores) to clean the contact surfaces of the board for the buttons that don't work.
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***''Do not''*** clean the contact surfaces of the buttons themselves as you may removing the conductive coating from the underside of the button.
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***''Do not''*** clean the contact surfaces of the buttons themselves as you may remove the conductive coating from the underside of the button.
Here's the ifixit [guide|99543] guide that will help. Go to Step.5 to view the image of the board showing the button contacts on the board.
Hi,
Use a Q-Tip ''lightly moistened'' (not dripping wet) with Isopropyl Alcohol 99%+ (available at electronics parts stores) to clean the contact surfaces of the board for the buttons that don't work.
***''Do not''*** clean the contact surfaces of the buttons themselves as you may removing the conductive coating from the underside of the button.
Here's the ifixit [guide|99543] guide that will help. Go to Step.5 to view the image of the board showing the button contacts on the board.