It does not sound like a DMD issue. Watch the video at http://www.shopjimmy.com/blog/2012/07/18/dlp-tv-repair-the-dreaded-whiteblack-dots/ to see the usual DMD failure. If it was a color wheel I'd think you've not lose just one color.
Look again at your cables. Did the RED component lead fall out?
I had to change the "lamp" on this tv, and now I don't get any red color. I tried to adjust for it, and no luck. I tried a "hard reset", turning it off by holding the power button for more than 40 seconds, then leaving it off for two hours, no luck. I read something about a "color wheel"? Is this likely a problem, and is it something a reasonably handy with tools kinda guy can fix?
someone else mentions a "DMD chip". I tried looking thru the postings here, but didn't see any mention of either, and I don't see a usable search area here.