Priva III works with AUX/3.5mm headphone output or RCA ported TVs.
Option 1 ： Use 3.5mm headphone output on TV
NO SOUND? Ensure your TV Speaker is set to "Headset".
Option 2 : Use RCA AUDIO OUT on TV
1) Use RCA AUDIO OUT, do not use RCA audio input.
You may test as following to find the correct RCA AUDIO OUT - connect headphones to TV RCA AUDIO OUT (use 3.5mm to RCA cable and 3.5mm audio cable). You should hear sound.
2) Ensure your TV Speaker is set to "External Speaker"
Option 3 : Use 6.35mm on most audio receiver.