The DMD is probably shorted and needs to be replaced. You can find another plama DMD in the market section for cheap or upgrade to LED.

I've seen shorted DMDs before. Before you install the DMD in another game I would urge you to do a short circuit test on all pins against ground. With the DMD removed from the game, take a multimeter and put it in ohms mode. Take your black probe and touch one of the the metal screw contacts on the DMD for your ground connection. The take the red probe and touch each high voltage power supply pin on the DMD. You should only get a beep/zero ohms/OL on the meter when touching the red probe on the ground pins (only pins 4 and 5). If this happens when touching any of the other pins, the DMD is shorted.

Pin 1: -125 volts
Pin 2: -113 volts
Pin 3: Key
Pin 4: Ground
Pin 5: Ground
Pin 6: +5 volts
Pin 7: +12 volts
Pin 8: +62 volts

I've read ColorDMDs may draw more power from the game's 5v supply. Have you checked the 5v test point at the power supply board with the ColorDMD connected?