I’m frustrated

DM10X control unit not working, need repair services

I have a DM10x control unit that won't work. When plugged into the correct adapter some of the lights glow and the LCD screen glows on and off but the unit does't function. I opened it up and there appears to be a burned diode near the power jack on the main board. I sold this unit used through Amazon and the buyer sent it back with this problem. He mentioned a Radio Shack adapter and I suspect he applied the wrong voltage. Everything but the one diode looks fine. How do I find repaired services and get and estimate on getting this fixed?
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