There are some who prefer to use the old Windows 7 Volume Mixer and Control. If you wish to have it, you will have to edit the Windows Registry. Open Registry Editor. and navigate to the following ...

Check if the reset helped by opening any app and testing the volume control. Getting the latest software update on your TV could fix bugs and glitches. If that doesn't resolve software issues ...

There's often a quick fix, especially if it's a simple problem ... Alternatively, alter the volume via the Control Center by ...