I have a 3.1 channel audio bar speaker model number 80319 b I'm getting absolutely no sound or it turns on but there's no sound coming through TV what do I do

SOURCE: popping sound from speaker when changing channels

This noise is normal with the cable box unless you set the cable box on HDMI sound

SOURCE: Have new LG 42" LCD and no sound on the 5.1 Surround Sound

Try running a set of audio cables(Red/white) from your audio out jacks on the back of your TV to your reciever's audio in? 

SOURCE: I plug in headphones, but sound still comes out of TV speakers

This information was found on the Dynex website: (http://www.dynexproducts.com/pc-680-23-dynex-32-720p-flat-panel-lcd-hdtv-matte-black.aspx) in the frequently asked question section on page 7. If the solution below dos not work for you. You can either go to the website by copying the web address and putting it in your address bar. Once there you can use the e-mail function to talk to customer support. You can also use the Dynex customer support telephone number 1-800-305-2204 between the hours of 7am and 12 am CST. Give them the model number of your television and the problem you are having with the use of the headphones. I hope this information helps you solve your problem. How do I get headphones to work with my TV? o Connect the headphone cable to the headphone jack on the side of your TV. o The sound will be heard through both the headphones and on the TV speakers. o Press Mute to hear sound only through the headphones. o Use the volume buttons on the remote to adjust the volume level. o You must remember to press mute again to hear sound through speakers. It will not automatically come on when you unplug the headphones.

SOURCE: Philips 32TA2800

The Way Im understanding your problem is,
it seems like you need to hook your rcas directly to the tv and switch the surround to aux or something similar to that.

SOURCE: I have a Samsung sound

There is usually and option in the tvs audio menu to enable only an external speaker output. On the remote for the soundbar, at the very bottom-- there are buttons to fine tune the audio-video syncing

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