It depends on many things, but the most basic question to ask is:
What input type are you using?
Whichever one it is that doesn't work (if it only does it for one type like just HDMI or just RF cable) that input might be either loose, open, or blown. If it does it no matter what you try to run your signal through, then I'd definitely get in touch with the manufacturer or a professional.
Well, I guess you should get in touch with the manufacturer either way, even if it's just for their own knowledge of their product's faults.
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