I'm very sorry for any inconvenience this may have caused you. Unfortunately, this sounds like it may need servicing. Here’s the thread where you can get details on setting that up: http://forums.cnet.com/7723-13973_102-542437/service-issues-click-here-for-help/
I have a Samsung 50" LED Smart 3D TV that now is showing 2 black bars about 1 1/2" wide running from top to bottom of the screen. I replaced the T-CON board, but that didn't help. Any idea what could be the cause?