In my experience, this indicative of TV tube failure. However, just to be sure, try resetting the TV to factory defaults by entering the onscreen menus, select Picture, then reset. Also, power-cycle your TV (turn it off and unplug for several minutes). More details can be found in the owner's manual. If these steps don't resolve the display issue, you may call 1-888-237-8289 in the U.S. or 1-866-237-8289 in Canada to schedule in-home service.
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