Why is there no sound after the hdmi hd line is connected to the TV in win8.1 system?

Why is there no sound after the hdmi hd line is connected to the TV in win8.1 system?

1. Right-click the Start menu, and click "control panel" in the pop-up menu to go to the "hardware and sound" option, as shown below.

2. Click the "Manage audio devices" option in the sound interface shown below to go to the page.

3. Right-click "speaker/receiver", select "set as default device", and click "OK".

4. The reason is that the HDMI cable has the sound synchronous transmission function. By default, the sound is sent through the speaker of another device, but sometimes the external device does not have a speaker, so we reset the speaker on the notebook to make the sound normally.

What is HDMI?

High Definition Multimedia Interface (High Definition Multimedia Interface, HDMI) is a digital video/audio Interface technology. It is a special digital Interface suitable for image transmission, it can transmit both audio and image signals at a maximum data transmission speed of 4.5 GB/s.
At the same time, you do not need to convert the number of forward lines/modulo or modulo/number during signal transmission.