Solutions depend very much on the available output methods on your video card and the input methods on your TV.
In principle it is possible, but if you want to have some kind of picture quality on your TV, try to prevent the use of analog signal transfer.
When both your TV and video card have a (spare) HDMI port you can hook up the PC to the TV with a HDMI cable and use your TV as second monitor on your PC/laptop. Then open the channel and make sure it is playing on the second "monitor".