Hi there and thanks for asking your question.
These TVs are quite susceptible to power and voltage spikes. Not being in the room with you and being able to inspect the TV, my hunch would be that you have fried your power supply which is quite common. This is a separate board inside the TV and can be replaced or repaired. Either way, you would likely be looking at a $175-$225 bill.
I'm sorry it isn't the best news.
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Is there anything I can test with a volt meter. Or would there be something like a burn somewhere on the power supply?