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06-18-2019 10:02 PM
When you cast the PC to the TV, it uses a different audio device.
See if installing this W10 IDT audio driver and restarting the PC, gets the speakers to work again...
06-19-2019 06:36 AM
Sorry that driver didn't work for you.
Unfortunately, I don't know what the issue could be since the speakers are not the default device.
Do you have a set of speakers that have the light green audio jack where you can plug it into the corresponding light green audio out jack in the back of the PC?