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Offhand this points to a failure of the set's Mainboard (which is the component solely responsible for producing sound on the set).
However it's worth it to try a hard reset, as sometimes the processor in the TV can simply have locked up.
The first thing you would try, is disconnect the set from power, then press and hold the power button on the TV itself (not the remote), for 10 seconds and release. Then plug the set back in, and also check that the power cord is connected tight at the TV as well. Press power once, and see if the set powers up normally with sound. Try this procedure up to 2 times, and please let me know what happens.