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The socket for the jack on the set has a leaf connection that when you insert the jack moves aside routing sound to head phones and cutting it off to speakers= the socket for the jack is out of position inside, either needs to be replaced or tweaked inside just a little.
Not much else can cause this if the headphones work.
This is because the cable you are using to connect your PC to your TV does not carry a sound signal, only picture. To play sound you will need to connect a pair of external speakers to your PC, or if you want to listen on headphones, connect the headphones to the PC instead of the TV.
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?
Connect the headphone cable to the headphone jack on the side of your TV.
The sound will be heard through both the headphones and on the TV speakers.
Press Mute to hear sound only through the headphones.
Use the volume buttons on the remote to adjust the volume level.
You must remember to press mute again to hear sound through speakers. It will not automatically come on when you unplug the headphones.
Just a thought...does the set have a headphone jack? When you plug in most headphone jacks it disables the internal speakers. If it does have a headphone jack trying plugging in some headphones to see if you have sound there. If you do, plug/unplug it a few times...worth a shot.