Most have RCA jacks that are inputs to the TV not outputs from the TV.
Since the exact model of the TV is not here, I can't check it out. Add a link to your model so members can see what's up.
I have a newer LG TV bought in 2014. I want to send the audio signal through to an older (1999) Harmon Kardon AVR 300. I am using gold plated audio jacks from the audio out on the TV to Video 2 (recommended by HK) but there is no sound. I've turned the audio to external speakers and still no sound. Do I need an optical cable instead of the audio jacks. Prior to the HK I was sending the signal through HDMI to a newer receiver in a different room. I swapped the TV's so the bigger LG is now in the bigger room and no sound is my result. Can you help?