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Tries tv unplug replug it back like about an hour later for the tv do a resetting itself back to the factory setting,this might help to solved this problems.Check the sound setting in the tv setup Menu it to speaker out not something else.If u are using the tv speakers.If u are using sound bar system or reciever system make sure all the connections output are correct and functioning,this will solved the problems.
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.
With this TV, you can turn the TV speakers off with the remote. This will not turn off the headphone output port.
Press menu, go to AUDIO, then go to TV speakers. You have the option to turn the speaker OFF there.
The speakers should have turn OFF automatically when you plug the headset into the headphone port. But, going over the manual for this TV; the option is to turn the speakers off manually with the remote.
audio board located inside the mainboard console to the right trace your speakers wire to bd, disconnect the three leads, 3 phillips screws, and examine bd for burns. If yes, ebay the board id for a replacement.
That was indeed the sound module. I spent hours trying to find a replacement for my Dell TV. There was one on eBay for over $100.00, I decided to remove my speakers and install a low cost sound bar from Radio Shack. Easy to install and sounds fine. Several techs told me those boards are a problem along with every other board in those sets and since the Dell is low quality to begin with, I wouldn't spend the money. Go with the sound bar and buy a real TV next time. I'll go Samsung or Sony when mine finally dies for good.
The speakers need some kind of amplification, if you have something like a set of computer speakers connected and they are not powered they won't work, try connecting them to the headphone jack.
Let me know the set up, what kind of speakers, audio settings from the tv menu.