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Test the TV with different inputs, as many as possible, whatever you have: antenna, cable or satellite box, DVD player, game box. Sound only missing with one input? You've partially solved it--check for a bad jack, cable, or source.
Sound missing on everything? If you have a headphone jack, insert the headphone plug in and out vigorously several times. A contact may be stuck in the open position on the back of the jack.
No help? Check your audio sub-menu for an option to turn off the internal speakers. Some sets have this for use with a surround sound system. Turn it on if you find it off.
Still no sound? You can try connecting an external amplifier and speakers to the set's auxiliary audio output jacks. That may get you audio, but won't fix the original problem.
If none of the above works, the set is due for a trip to the repair shop, unless you want to avoid the expense. In that case, a trip to a recycle center.