Why doesn’t the sound work on my TV from my laptop?
Make sure the volume is turned up. You also may need to go into the set-top box menu and select HDMI in the Audio Settings or Audio Coding section to pass the audio to the TV. Earlier versions of set-top box firmware didn't properly handle automatic HDMI connections.
How do I get sound on my TV from my computer?
0:213:32Connect Computer to TV With HDMI With AUDIO/Sound – YouTubeYouTube