This is usually a menu option that you can reach with your remote. I don't have this particular TV, but if you can turn them off, it is usually a menu configuration option. Hunt around with your remote until you find the configuration menu and look for the "sound" settings.
If your TV has a headphone jack, try plugging a set of headphones into the TV to see if that disconnects the internal speakers. If it does, go to Radio Shack and buy an appropriately sized blank plug and just plug that in to the headphone jack to disconnect the speakers.
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