Win8.1 notebook using HDMI HD cable to connect the TV without sound?

1, open the Control Panel, into the "hardware and sound";

2, click the Sound of "management audio equipment";

3. Right-click "Speaker/handset" In Sound equipment, select "Set as Default Device", click OK.

4, the reason is because the HDMI line has the sound synchronous transmission function, by default will make the sound through another device's loudspeaker, but sometimes the external device does not have the loudspeaker, therefore above we reset the notebook the speaker to be able to emit the sound normally.