HDMI to TV Monitor-no sound problem in Linux 19.2 etc

You need the Pulseaudio Volume Controller

Using Terminal type in     sudo apt install pavucontrol

Then go to Sound and Video in start menu

You will see Pulseaudio Volume Control

Open it and click "all output devices" lower right

On the top of menu

Input Devices- Monitor of HDMI audio

Output Devices-shows HDMI

Keep arrowing to the right to "configuration"

Go to Profile- in drop down hit HDMI PORT Digital Stereo

Now.....try your sound--it works!