Soundbar works on other devices (laptop/phone), and headphone jack on TV works with headphones, they just don't work together. Also tried headphone input to soundbar and RCA cable to TV. Tried both connection combinations with TV speakers ON and OFF. Tried cycling inputs on soundbar, with the two different connections (RCA/headphones to soundbar/TV) with speakers ON and OFF. Tried different channels with those connection combinations as well. Still no sound.

Audio Players & Recorders - Unknown - Vizio SB4020M-A0 Home Theater Sound Bar