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Un-mute sound. Be sure speakers are not turned OFF. Go to settings menu, audio, then check the speaker settings. When used with a separate stereo, or surround sound system, the speakers need to be OFF. When used in a stand alone mode, they need to be turned ON. Someone may have turned them OFF in the audio settings. That's the easy fix. If there is something wrong with the on-board amplifier, the problem gets harder. Regards.
Make sure TV is not muted.Make sure the TV is not set to SAP (secondary audio protocol)Make sure TV input is correct (someone may have accidentally pressed the "aux" input button or similar causing the TV to use an input with no sound going to it)Make sure there is not a pair of headphones connected to the TV audio out jack on the side or front of your TV.Check all of the cables that are connected into the back of your TV. (it is possible the TV was moved slightly and a cable has become disconnected or loose)If you have a receiver or surround sound connected to your TV, turn it on and see if you get sound coming from the external speakers.Turn off the TV, cable box, and anything else connected to the TV. Sometimes turning everything off and then back on can fix the problem.If using an "S" video cable into an input on the back of your TV, these cables carry no sound, just video, so make sure you connect an audio cable too.Hook up an external device to the "TV audio out" input. This will be the test to see if it is a TV circuit board malfunction or the speakers are faulty in your TV.If you are connected to a satellite box, use the included remote and go into the "menu". Check to make sure sound settings are set correctly.
Read More: http://removeandreplace.com/2013/11/14/10-ways-fix-tv-picture-sound/#ixzz3lTeW6isH
On the back panel of your tv you will see two audio inputs labeled AUDIO TO HI-FI. Plug your surround sound audio jacks, ( red and white ) into that. Plug your video jack ( yellow ) into what ever number input you are going to use for dvd, if needed. This will allow you to watch tv and hear it in your surround sound. You should also go to menu- then- audio option and turn off your tv internal speakers, this will allow your tv remote to control your volume of surround sound. Hope this helped.