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-Have you try frame Shape...? If not then try frame Shape.
What it is...? It's a shape like rectangle, square and taller area or wider picture.
On the remote control should have a button label " P. Size" -Try this button . it will change the shape of the picture. If it's still not help then a new TV.
You need a professional.
Stop using the TV until it is repaired.
Continue to use it and your problems will multiply and grow more expensive.
Call the manufacturer to find you nearest authorized service center.
MR. TV Sales & Service Inc
Milwaukee Wisconsin 53405
Yes, the lamp will gradually get darker as it nears it's end. The rolling lines sounds more like the set is on a local channel for the cable hook up. If your local area has a channel 3 or 4 live terestrial broadcast simply tune the cable box output to the other one, the same for the tv. If this is cable/local broadcast issue it will go away in Febuary when the NTSC broadcast ends.
the reflecting mirror is likely loose and falling down inside the light reflecting tube. you should have seen the band getting darker and larger, the small mirror is in front of the lamp and bends the light, remove the lamp and look down the tube (light path)
The dark side of the screen causes of the lamp alignment or prism glass alignment. This is critical you have to consult your LG technician to do this. But if you have any background o repair consult the service manual. Please careful not to touch the prism quarts so that you maintained the clarity of picture and brightness on the screen.
i have a very simliar problem, i found a way around it by changing a seeting in the advanced options. somehow, my horizontral position was changed from wahtever the default was to 88, which set it too far to the left. set it back to 50 and while the image was good, the menu is still in the oddly placed area....oh well....hopefully it's not the bulb, i just changed the damn thing less than a year ago