HDMI ARC (Audio Return Channel) allows audio to flow both ways through a single HDMI cable. Use the HDMI ARC port (usually HDMI 1) when connecting a soundbar or receiver. Make sure the cable supports ARC and enable it in TV settings.
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This often happens when multiple audio outputs are configured. Check if you have a soundbar or receiver that's turned off - the TV might be trying to send audio there instead of the built-in speakers.
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Software updates often fix audio bugs and improve compatibility. Always keep your TV updated. Go to Settings > Support > Software Update > Update Now to check for the latest version.