SOURCE: samsung 1080i compatible tv 42 inch
This is very common with Samsung and is considered a overheating or lamp issue. cheapest fix before changing out the lamp is to unplug the unit after it has shut off its fans and open the back up and blow all the vents and circuit boards off with can of compressed air. Then remove the lamp to get to the larger fan that is behind the lamp, be carefull to not let the fans to spin when you hit it with the air because it will spin the fans faster than they are ment to spin, so gently place a finger on the blades just enough to keep the fan still and clean off any dust you see on the blades and area. Put everything together and give it a test run. If it stays on longer you know it was just to dusty to stay cool , if no change then try the lamp.
SOURCE: replacement color wheel for samsung 50'
I got my hlr5078wx/xaa repaired by an authorized service center and they replaced the color wheel with BP9601103A and my television works fine. It was replaced about 2 years ago.
SOURCE: samsung hlr5078wx DLP tv. rumbling noise and shaky picture
This is a color wheel problem.
I would recommend to use professional help because you can make more damage to the optical engine. Not to mention index delay have to be re-adjusted in special service menu after repair is complete.
Regards.
Russ.
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