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Hi Astro78
Firstly what is a single drive hand controller. I can't identify it by that name. The most common failure with over voltage is blown capacitors especially tantalum. IC's often survive over voltage as long as they don't draw too much current that cooks them.
If you had a photo of the board it may help. A circuit diagram would be even better.
Without knowing the part it is impossible to diagnose. Have you access to a multimeter. Check for shorts on the 5/6 volt supply line. If it shows a short look for diodes and capacitors and if supect unsolder one leg and see if the short goes.
Barry
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