If all the reset procedures don’t work and you have no red light for off mode then it’s the power board - my 65 2 year old Samsung broke and I ordered new power board from internet 60 bucks- put the tv on a bed and opened the back screws are not that bad …. Saved 1000 bucks….look on you tube for video on how to swap out power board……tv repair will charge you about 100 under replacement cost - don’t do it…
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