Hello David
It sounds that the back light inverter board, and back light CCFL lamps to your TV need to be checked. It will be best to contact any service technician, because to check its back light CCFL lamps, you must disassemble the display panel, a very skilled work indeed. If you are sound in electronics, you can check it. If you wish to know more
http://electronicshelponline.blogspot.com/ check this link. It has details. Pull up older posts there by its left side bar, or see it in 'Timeslide' option.
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