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This could be your video board going bad where your input cables are connected --OR-- the color wheel going bad. Hard to tell without a photo or reference though. Try swapping the cables first... and listen for any winding or whirring sounds.
Hello: The problem is that a small mirror on the light tunnel has fell off causing a shadow in the picture,. In the past the only way to repair this problem was to replace the entire Optics Engine. But Samsung decided it was replacing entirely to many light engines so they decided to allow and train technicians on how to do it. It involves removing the color wheel and behind it is the light tunnel where light from the lamp shines on to a maybe 1 1/4 inch small block with three mirrors on all sides, your problem is that one of these mirrors has come loose from its side, causing a shadow with the pic still in the background. So if you call a technician to come, if he has'nt had the training from samsung on how to do the procedure then he will want to replace the entire optics engine which is the expensive way of doing it.
So when calling as if they know how to replace light tunnel. There are some adjustments that also needs to be done once it's replaced. To verify what i am saying go to this site to find out more. http://www.avsforum.com/avs-vb/showthread.php?t=758625
OK in order for you to enter Service mode you will have to disconnect Plastic jumper wire under sticker on the DMD Module it is the Middle Alumi Moduel it connect to both sides of boards, After you do this with TV off Press mute-1-8-2-power Select DDP1011 then adjust display.
If you're seeing a shadow either vertically or at an angle the most common/probable cause is the light tunnel in the light engine. I have this same problem with my ru-44sz51d and have found many people with similar problems. For reference search "dlp light tunnel" as many samsung dlp's are suffering from the same problem and have been since they were purchased. You should be able to repair this yourself, but only if you feel comfortable and are knowledgable in such a situation. The repair may consist of replacing any number of the 4 or so mirrors or just reapplying the silicone adhesive to the original mirror. As I have not done this yet myself I can only speculate and refer to topics I've read about. Good luck
Is it an LCD or DLP? The Model below suggests it is an DLP. Sounds as if you have the dreaded light tunnel collapse common to all LG DLP TV's. Inside the light engine there is a square tube made up of four mirrors. These mirrors deform and crack with the heat of the lamp. They fall down over the light aperture and cause a shadow of varying degrees. It is fixable now at a realistic price ( used to have to replace engine) as LG have made the parts available. It would take a competent tech around three hours to complete or if you are technically minded you could do it yourself. I hope this helps. Good Luck.
I have read about this issue many times, it is the mirror inside the light tube that is coming unglued , you have to take it apart and reglue the mirror in place. I think if you remove the lamp you can see the mirror down the tube. use some high temp silicone to reglue it.
Don't recommend replacing the light tunnel if you never had any experience with DLP optical systems. you need to pay careful attention to the way you remove any screws or you will be forced disassembling the engine multiple time to get the alignment correctly.