i have the same problum,,,
My TV is model lnt4661fx, 46" 1080p lcd. It is a little over a year old. In the past week, when I turn the tv on for the first time, on the right side of the screen there is an issue. 3 horizontal lines divide the screen equally, but they only go about half way. Then the image on the right side is doubled, like when an old projector tv was out of convergence. The image also hangs around like burn in for just a second after the image changes, so its always displaying the last image over top of the current image.
This only happens when the tv is first turned on for the day, and usually clears up after about 5 minutes or so. After 5 min, it displays perfectly and will continue to do so for the rest of the evening, even if it is turned off and back on. Of course the TV is now out of warranty. I am hoping it is something simple, or at least inexpensive to fix.