Dark shadows can appear on an LCD TV screen when an image has been displayed for an extended period of time. Individual pixels on the LCD screen can become temporarily fixed with a specific color. This situation is often referred to as image retention or burn-in. Remove the dark shadows by displaying the correct kind of images on the screen for an extended period of time.
Press "Input" or "Source" on the remote to select the "Antenna" option.
Tune the TV to an off-air channel that displays black and white static.
Turn the TV to a normal channel after eight hours.
Repeat the steps if the dark shadow is still visible.