Introduction
With these remotes it seems to be a common problem some buttons cease to work after a couple of years. Usually, you just need to open the remote and clean the circuit board.
Tools
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            Open battery housing and remove the batteries 
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            Remove the screw located in the center of the battery housing 
 
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            Top and bottom shell of the remote are held together by 4 latches per side. The most fore and aft ones are located about 1cm from each end 
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            Pry them open with a small flat head. If you're carefull that will leave only tiny scratches, but it does take some force 
 
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            Once open, remove the insides and clean them from all the drinks and what not that has been poored over the remote 
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            If necessary, add contact spray or alike to the buttom of the rubber buttons 
 
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            After cleaning and before full re-assembly, you might want to try if things improved. 
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            Put the cicruit board back in, add batteries and put the rubber mats onto the circuit board 
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            If the repair worked, you should the red top LED flashing 
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            Put it all back together again. (Don't forget the screw in the battery housing.) 
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            You might need some new batteries as well 
 
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To reassemble your device, follow these instructions in reverse order.
29 comments
thanks, I fixed mine using your guide.
surfer -
You are a life saver, just fixed my onkyo RC-737m control with this guide... Broken a plastic clip but can't tell when it's back together. Cheers again! Leon