Maybe the antenna is not plugged in your TV. Without the antenna plugged in the TV's tuner, you won't be able to find any TV channels. Also, ensure that the antenna is firmly plugged in.
Maybe the antenna cable is bent or cut off. Inspect it carefully and if you find a cut part, replace the cable. If you are subscribed to a cable TV operator, contact them and they will do this for you.
You won't be able to pick up TV channel if the antenna plug (connector) is detached from the coaxial (antenna) cable. Double-check if and ensure that the connector is firmly attached to the cable.
All you need to do is to turn off the TV and turn it on after a minute or two. Also, you can unplug it from the power outlet and plug it back in after a few minutes.
If the TV's antenna connector is loose, or misplaced it won't transmit the signal to the TV tuner. In this case, all you need to do is to resolder the connector back to the TV tuner, using a soldering iron.
The wisest course of action would be to take your TV to a repair shop and have them repair the connector as the TV tuner is very sensitive and can be easily damaged.
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