Your post stylizing is upside down. The thread title is to catch the audience while the thread body is to explain to the audience what the issue is.
Mind sharing the make and model of your headphones and the TV? Does the headphones work on your smart phone? To add, when using a headphone on a TV(pretty much any TV, the speakers get muted and the volume control on the TV manages the audio on the headphones(connected audio system).
There are some TV's that allow for management of audio in spite of having a headphone connected.