Connecting Mac Air to TV and sound problems

I have a Mac Air 13, 2011 and have connected it to my Sharp Aquos TX using the Mac HDMI adapter, I get picture on TV and computer but sound only on computer.  What do I need to do in the settings?

Select your TV as the output device in System Preferences > Sound > Output tab > click on the TV.
You can also hold OPT as you click on the sound icon in the menubar to select the output device.
Regards,
Captfred

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