Your power supply is shorted; remove it from the set and, have a TV shop repair it if you are unable to do the repair yourself.
any good shop can do the repair easily and, much cheaper than the manufacturer you can find the power supply by looking to where the power cord enters a circuitboard that will be the power supply
Turn cable box and tv off then wait 5-10 hours then tun the cable box on first then the t.v.
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