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It may have been set in to mute mode, check it out through your remote. If you have done this and found that it is not, it may be on the cables. Pull out all cable that is connected and pull it in again one by one and try to hear if sound is being restored.
Try switching the external/internal speaker switch on the back of the tv to internal. This way you should at least get sound (from the TV not the sound system) when you change the volume of the TV itself.
Explain your set up if you need more help. By that I mean what do you have hooked to the TV and sound system, Satellite or digital cable box DVD ?
Make a note of where all the inputs to the sound system come from.
On the back of your set there are 2 switches that tell the tv whether you are using the internal speakers or the external speakers.
Make sure the switches are set to internal so the speakers in the TV receive the sound signals. If they're set to internal maybe the internal speakers are bad. Set the switches to external and hook up external speakers to the speaker terminals on the back of the TV. If neither setup works then it sounds like an output transistor or related parts.
First, start by unplugging set to try to reset. Then make sure that all settings in audio menu are correct. Also look for stuck volume up button on set and on remote. Sometimes buttons get lodged under surrounding frame. Also try to push volume down button on tv and watch for display on tv to see any change. If when you release button volume increases by itself, remove batteries from remote to eliminate it as cause. If nothing you try works expect to replace main pcb. You can probably price it online with model number. Good luck, Russmann.
I have the same problem with my 51S500 which just started. I used to have it set at 12-14, now needs to be 25-30. Playing DVDs is not affected. External speakers hooked into the external speaker jacks are affected.
if there is no problem with the surround sound, you have a problem with the volume regulation circuit or with the main amp of this TV set, But to say the least is you have a backup to fix your problem, with the sound system, you said it works fine. this could run ya about 250 to 400 to repair. Good luck.