If it is an old tub TV, most likely it does not have a digital tuner. If it is a flat-panel TV, most likely it has a digital TV tuner. So, to to the TV settings/setup and see the menu options. Maybe start a TV scan and see if it mentions “scanning for digital channels” or something similar, or check if there is a signal-strength meter. You can also try to connect an antenna and see if it can find any digital channels.
A built in digital tuner comes standard on all TVs made after 2007. This allows you to receive over the air digital transmissions on your television with just an antenna without having to buy a digital converter box. After Feb 17th, all television stations will broadcast in digital format, which means in order to watch TV with an antenna, you either have to have a newer TV with a digital tuner or an older set with a digital converter box.
Connect your satellite, antenna or digital cable to the rear of the television, if you are using any of these services. The cable should be attached to the “RF” in socket. Although the television has a built-in tuner, it has to receive the signals from an external source.
Turn on the television. The words “initial set up” should appear on the screen. If this message doesn’t appear, then use the remote control. Press “Menu” and then select “Set Up.”
Run the setup. Highlight “Auto Scan” and press OK. The set will automatically search for all available channels. Wait for this scan to finish. The set will give the message “channels found and stored.” Press OK.
Check to see which channels were added.