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first, i wonder what you are trying to watch? a dvd player? a cable box? do you have your cable directly to the tv? if you try a different source, do you get sound?
on the tv, if you go into menu and sound options, did the speakers somehow get turned off?
or, is there a switch at the rear of the tv to allow your tv speakers to act as a center channel? if so it may have been hit and switched off the speaker output. my tv has one located right where all the connections are and i've hit it accidentally a couple times.
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.
Please unplug TV from AC wall socket for couple of minutes, replug back in and turn it On and check sound. If problem still exist, check internal speakers are enable / ON in Menu. If speakers are ON and yet no sound, then need to check sound at Audio Out jacks at back of TV, hook audio cable (white-red rca pins) in audio out jack in TV and receiver/ amplifier to get TV sound in receiver/ amplifier speakers. This is a test/ check and you can use it to get TV sound through receiver speakers. And if still no sound in audio out jacks in TV then TV needs main board replacement. Check with local TV repair shop for that. Thanks.
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.