This would be due to a bad power supply board inside, replacing this will put you back into biz again around $50 for the part @ samsung.
Thanks
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Have seen it more than twice before. There is possibly some problem with the inverter board that provides the power for backlight lamp. the on and off feature is some sort of electronic fuse. Sorry, but I guess a certified technician is required for relevant repairs. also, parts are hard to obtain.
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