On the right hand side of the screen there is a dark shadow that it about 8 inches wide running down the whole side of the screen. Research sugggests that it is something to do with mirrors coming loose inside the'tunnel' Everyone tells me that it is too expensive to get fixed. I have changed the bulb without any improvement.
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If there is a dark line with two sources such as a dvd player, and a game system, or a cable box, then the tv will need to be repaired. If not from two sources then the issue is with the only source causing the black line.
turning off the main can be very harmful to rear projectors if you dont wait for the cooling off period, for instance when you turn off the tv from the remote, the fans inside are still on in order to dissipate the heat given out by the lamp. as a result some of the lens inside the engine may have burns-in caused by excess of heat.thus leading to shadows on the screen.
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.
Need some more details the problem you describe could be anything from a simple convergance problem or the light tube going bad in a light engine, one problem about $80.00 to fix the other, slightly over a $1000.00
reseat the LVDS cable inside the set. this is the multi wired connector that connects the main board to the panel. if that doesn;t solve your problem replace the main board. if you turn off the set and you can still see it in the screen it is the panel.