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Hello, I'm Shahid. Sorry to hear that you're having trouble with this but I'll do my best to help.
- Do you hear any high pitch screeching sound from TV when power it On?
OK, are the cooling fans running smoothly or any error message pop up on screen then TV switch Off?
OK, I'm out of ideas what it could be so let me repost this question for other experts to have a look.
I'm opting out to repost this question.