Facing TV Problems? Ask a TV Technician.
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Is this on a plasma or on an LCD/Led. If it is the latter, it could be a problem with the back light or backlight inverters. To find out, look closely at the screen and use a flash light on it to see if you can find even a hint of a picture. If you can, then it is probably just the backlight inverters. If not, it will be something more serious - one or more of the boards, or the panel itself.