Why isnt my tv sound comming out of soundbar

Use the left and right audio out from the TV

what brand/model of soundbar and tv?

Does your TV have a Digital optical port? It's a cable that sends a red light source. That is actually how you're suppose to hook up a soundbar. digital optical cable Bing images Straight forward. Plug and play. If you're TV doesn't have an optical port, as I know your soundbar does then you have to use a stereo Y Cable. 3.5mm to Red/White. Sound bar will have 33% the power going this way as opposed to an optical cable. Aux Audio Out has a itty bitty amp pushing power. Purpose of the Digital optical Cable is a light source.

Be sure you are hooking up the Audio Output from the TV or satellite to the soundbar.

From the satellite box both Audio Output and Video Output go to the TV, and then Audio Output from the TV goes to the soundbar.
Or
From the satellite box Video Output goes to the TV and Audio Output goes to the soundbar.

This may help as well:
https://www.youtube.com/watch?v=Z27WtBy4IUs

You may need to enable sound output in the tv menu

You hooked up the sound bar to the cable box red & white sockets, right. Now you have the soundbar hooked up to the TV red and white sockets. Did you notice any difference with the labeling on the two sets of sockets? The cable box sockets were labeled "Audio Out", but the TV sockets are labeled "Audio In"

AV signals are directional. Any socket labeled "Out" will give a signal from it for connecting to another device e.g. the connection from the cable box to the soundbar.

Any socket labeled "In" is designed to accept a signal from something else, but it won't give a signal out. So you can't connect the TV's Audio In socket to the soundbar's Audio In socket because both expect a signal from something else and neither supply a signal out.

Check the back of the Proscan TV. Is there a socket labeled Audio Out? If so, use that.

The manual can be downloaded from this site.

http://content.etilize.com/user-manual/1022923625.pdf

Follow instructions on top of page 7 using the Source button.

The Onkyo has a center channel pre-out that you can connect the sound bar to. How does the sound bar connect to the TV? Is it two rca jacks, 1 red and 1 white or black? What brand and model is the sound bar?

there is no hdmi on the soundbar???