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Older projection TVs use three separate "light guns" to essentially paint the picture on the screen. What likely happened, is one of your guns went slightly out of alignment.
You can either get it repaired, or attempt to align it yourself. It is doable, though tricky and rather risky. The process would depend on the type of TV you have. If it is a TV that uses the three separate light guns, then it's likely a few years old, and it might be tough to find instructions online for your particular model.
Yes.Depend how old is ur DLP tv,the Projection Lamp only a light source,mostly depended on the Light projection Engine itself.Get the original RCA DLP lamp or same lamp model now inside the tv,will help and work best for ur tv.Just don't get generic DLP tvs lamp,it cheaper poorer quality.
I guess you mean by remote and the front panel button? I had that problem and I took off the top rear panel and moved my front control panel circuit board to the left just a little. This is looking from the back side. I guess the buttons were no longer lining up and the infrared sensor may have been blocked preventing the remote from controlling the tv. I also unpluged and then reinstalled the control panel wiring harness. It was blue and is right behind the middle picture tube. I hope this may help someone if not you.