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most likely the dmd board on the rear of the lens assy, but the main board can't be ruled out either. you can take it apart and try cleaning both ends of the connection between the main and the dmd and then reseating this firmly, it that doesn't work unless you know which part to replace, you should have it repaired. I have been frustrated working on projectors like this before and given a good hard but controlled slap on the top of the unit and the problem has gone away, but sometimes only for a minute or so.
I had a smililar problem after taking it apart i realised that i had screwed my mount skrews into the video main board and cracked it along with a few soldered wires, if you havent done any physical dammage to it try a firmware upgrade