TY says "weak or no signal"

All system appear functioning.. No red lights, or flashing. BUT, my TV says " weak or no signal". My system appears to be normal without issues, but hooking up with TY is now an issue. I have tried all I know, and still "weak or no signal". thanks

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2 questions: How do you have the NES Classic connected to the TV? What source is your TV set for?

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