If your TV has a picture but no sound, start by checking the obvious such as whether the mute button is on or whether the volume has been turned all the way down.
Next check your cable connections and make sure everything is plugged in tightly.
Change channels to make sure that it's not a technical difficulty with your TV service provider or TV station. Call your service provider to see if they're experiencing issues with their audio.
Try reconnecting the HDMI cable after you turn off the TV.
Make sure your remote is on the correct input, and see if you have sound while playing a DVD or video game.
For a simple troubleshooting checklist, see
No sound on TV and get more details on some simple fixes for this problem. I hope this helps!
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