Make sure the sound output is set to TV speakers and not Audio system

Check the following

• To verify audio is sent from the TV speakers, press the (Mute) button to make sure the TV is not muted, and then press the VOL or (Volume) + button to turn up the volume.
• Check the sound setting.
  • Open the settings screen according to your remote.
    • On the remote control, press the Quick Settings button → select Settings
    • On the remote control, press the Home button → select Settings
  • The following steps will depend on your TV menu options
    • Select Display & Sound → Audio output → Speakers → TV Speakers.
    • Select Sound → Speakers → TV Speakers.
    • Select Settings → Sound (or AV setup) → TV Speakers.
• If headphones or a Bluetooth audio device are connected, then audio is not output from the TV speakers. Remove the headphones or disconnect the Bluetooth audio device.

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