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Hi there and welcome
First, can you remove the power to the TV (unplug it from the power socket) and let it sit for 10 minutes.
While waiting, hold the power button in for 60 seconds then release
Then connect the power, turn on the TV and tell me if it then starts please
Thanks Shannon, it confirms the problem.
It is the power board that has faulted.
I am really sorry about this and you are going to have to return the TV to have this replaced. It will be covered by the warranty if this has not expired, and the replacement will be done at no cost to you.
I am really sorry about this, and if you have problems, or would like any additional information or assistance, please do not hesitate to let me know.
And if you can take a second to rate my service, that would be greatly appreciated.