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I would not have expected it to be a power supply issue unless it was turning on and then turning off. The picture problem would be either in the panel or in one of 3 or 4 boards inside the device. Is the panel completely black? Was there anything – any type of pattern that you can discern the screen prior to the failure? If it's something other than black, if you could attach a picture here what looks like that would be quite helpful.
If the problem turns out to be the screen, that can be an expensive repair. However, if it is one of the boards, the hardware is not expensive and generally parts are not very costly. If you can, try to get a new part versus refurbished because refurbished parts with TVs tend to be a good way through their useful life. I would appreciate a moment of your time to rate my level of service using the okay, good, or excellent rating icons. Thank you.