TV problem?

I have a Sceptre 4K TV. Whenever I turn it on it works for about 5 seconds than goes black. I can still hear the TV and when I get really close to it

I have a Sceptre 4K TV. Whenever I turn it on it works for about 5 seconds than goes black. I can still hear the TV and when I get really close to it I can see the picture. How do I fix this. When it goes black it fades to black and when I get really close I can still see the TV. Did I do something wrong in the settings or remote? Or is it broken?

or:I have a Sceptre 4K TV. Whenever I turn it on it works for about 5 seconds than goes black. I can still hear the TV and when I get really close to it I can see the picture. How do I fix this. When it goes black it fades to black and when I get really close I can still see the TV. Did I do something wrong in the settings or remote? Or is it broken?

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