Take the batteries out of the remote. Press the small button on the *Chromecast dongle/device itself. This starts the scan for Bluetooth accessories. Put the batteries back in. The remote should automatically pair. If it does not, repeat steps 1-3 (this failed for me first try but worked on the second). 6.
Here's how to do so: 1. Unplug the power cable from the Vizio TV and leave it idle for some time (a few seconds would do). 3. Press and hold the Power button for a couple of seconds. Repeat this step a few times. 4. Plug back in the power supply and power ON the TV. Check for the issue now.Occasionally the remote would stop showing the white light for a couple of seconds and then start pairing again. This also had no impact. Finally, u factory reset the chromecast itself and the remote light went away and paired instantly. So the fox for a remote stuck in a never ending pairing mode is to factory reset the chromecast.
Open the Google Home app and select the device with which you have the no sound issue. Now click on the Settings icon and then tap on the three dots on the top right corner. You will see an option to reboot the device. Wait for a few minutes for your Chromecast device to reboot, and the sound will most likely be back on.