Not enough information to give you an exact answer. Model numbers would help.
Most TV have a digital audio output (usually optical).
Your JVC system should have a line level input with either RCA or 3.5mm connection.
You will need a digital to analog converter and cables to connect it to the TV and the JVC. Check the TV manual on how to use that connection. You may need to turn it on, turn the TV speakers off, and change the audio to PCM stereo.