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I would bet on a backlight problem. They're tiny little fluorescent tubes, and like regular fluorescent lights, they get old and stop working. What I've seen happen (in my admittedly limited experience) is that the tubes go bad or weak, and the power supply (think ballast) still sending the tubes high voltage, through tiny wires, and the HV leaks out and arcs to ground. The backlight goes out, obviously, and depending, the power supply may stay on and run the tv anyway, or turn itself off as a sort of failsafe mode.
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