Sounds like a part failure. Can you post a picture of the back of the DMD?
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1 week later
From what I read, you proved the problem follows the DMD and another DMD works in the game. That is a good start.
Can you set your voltmeter to DC voltage and see if you can tell the resistors along the edge of the DMD on the columns and rows are pulsing? Wedge your black ground meter lead under the ground braid wire in the bottom of the backbox so you only have to worry about holding the red meter lead. I think if you measure 10 of each of the two sides, I think I would get a feel if it is a column problem or a row problem. I also would have to ask, do you have surface mount solder experience? Pretty much guarantee a problem will be a surface mount part.
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