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Hello again. I think I've solved the problem now. When I removed the metal heatsink/backing plate/AC earth from the back of the board, the diode, switching transistor, and bridge rectifier had to have their thermal stuff re-applied. Originally, th…
Thanks so much! I will investigate the board and figure out how the motor drive works. I suspect it may be something with the switching transistor since that's what I messed with last. The AC supply is direct to the wall with the factory cord.