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you have to open the back cover to check weather the screen back light need replacement. usually if the lamp is almost black in color it needs replacement. the backlight is covered with metal shield installed at the upper portion and lower portion of the panel of the tv.
All plasma an lcd TVs have boards that control vertical and horizontal output to their respective areas. They are connected to the screen by ribbon cables. If one of these boards fails all together, has a failed chip, a bad connection, or a bad ground somewhere it will result in a black line in the area of that board. A bad ribbon cable connection on the bottom will result in a vertical black bar though the screen. Many times resetting the connection will fix it, if the ribbon cable has been nicked there could be a severed connection. They can sometimes be fixed, but it is a pain. An yes I have done it, and the bar is gone. The same will happen if the chip that outputs to that area opens. The connectors are the first place to look paying close attention to the cable, they are extremely delicate so great care must be taken if you decide to tinker with em, the usually have lift locks that release them, but it is very easy to wreck em.
ok so what you need to do is have your tv degaussed...its basicly a strong electric magnet rubbed in fron of ur tv screen..you can buy a degauss for 30 us...or its cheaper to just take it to a tv repair...also some new computer monitors have a degauss setting..put the screens facing each other and hit the degauss funcion on the monitor..do it several times or till u see results.....enjoy
It maybe a circuit control board for the screen. Last thing you want to do is void the warranty by opening up the TV.
Best to use the warranty at this point. Here's info to get you started. Phone Numbers
Technical Support or To Place an Order Toll-Free: 877.698.4946 (877 MY V I Z I O) Technical Assistance Emails: [email protected] Customer Service
Toll-Free:888.849.4623 (888 VIZIO CE)