We don't have any sound on our Dish channels

Are any other apps have sound?

What troubleshooting have you done so far?

I'm sorry, I will need more details about that. Have you checked if the TV is in mute mode?

Have you restarted anything by unplugging, including your Dish, Samsung TV, and sound system?

Noted, thank you! When you get back to youtube, there is still no sound, correct?

Please, follow this to test the sound:
Press “Menu” on the remote, then select the “Support” option. Choose “Self Diagnosis” from the options, and then select “Sound Test.” The TV will play a melody out of the built-in speakers. Let me know if you hear anything from the TV.
Note, that it can be a different location, depending on your TV model. The way may be Home -> Settings -> Self Diagnosis.

You don't have it in the "support" or "settings" options?

Do you know the exact model or the year of your TV?

Do you have this path?

1. Open Settings, and select Support.
2. Select Device Care.

Got it, in this case, can I ask you again, have you performed the "hard reset" by unplugging everything for 2 minutes?

Thank you! Let me know, once you finish and if the issue with the sound is still there. Try to click the "mute" button a few times after the hard reset.