Why would TV say no signal?

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Tags

1. #selected
2. #first
3. #message
4. #correct
5. #fault
6. #source
7. #haven
8. #incorrect
9. #changing
10. #caused
11. #input
12. #antenna
13. #already
14. #check
15. #signal
16. #digital
17. #being
18. #likely