What is the source of the TV signal? If your TV signal is over the air, check the cable and the antenna direction. If you use a splitter or amplifier, try a direct connection.
If your source is a set-top box, make sure that the box is on. Next try different cables. Try other sources.
If other sources do not work, you either have a tuner problem or a problem with the input section of the board of the TV.
I hope this helps. For additional information, please add a comment with the model of your TV and the source.
Cindy Wells
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