I'd try another power cord and test the power outlet with a lamp or other thing first. That's where user serviceable ends and you are in possible lethal areas inside the set.
https://www.youtube.com/watch?v=8HG7efTMj78 is a fun watch but I find many looking for 100% correct it's this part answers. Since the failure can be more than one thing, you have to either take the chance or have it repaired.
my tv is not turning on and there is no red power blink . can you tell me if any one had this issue before?if yes what was the solution?

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