What's one of these units worth? Do you have a photo of the internals? Without a schematic or functional diagram of how the circuit works, I doubt that it's worth trying to get the controller repaired, let alone stabbing in the dark trying to clean it or look for a faulty component without proper test equipment. It will probably cost more to fix than a new one and I'd hesitate to trust the thing if I have to fiddle around trying to clean the circuit board or look for a cold solder joint visually. Sorry if I'm not much help or very encouraging, but sometimes it's just better to move on and get a new unit.
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