Is the power light lit when you are trying to get the set to come on please?
There is a procedure to follow (the set does have an internal issue)other than rebooting the set which I guess you have tried (unplugging replugging back into wallpower) then the first check is a visual one on the power-board modern TVs can suffer from bad capacitors on the power-board so the result of this first check will govern the next do you think you can do this work yourself?I will be happy to provide all the necessary info you need in a simplistic way I can so you can fix this yourself, it may however men replacement of a board
Let me know please
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I am sorry this is something you are not comfortable with in that case you will need a tech www.tvrepairpros.com will locate a tech in your area
Let me know if you need more help