Hi there,
First, let's ensure the Samsung TV speaker is chosen when you are using DIRECT TV. To do so head to Settings> Sound> Sound Output and select TV Speaker.
If that does not solve your issue, then we will need to test the sound. To do so navigate to Settings > Support > Self Diagnosis, and then select Start Sound Test.
If the test reveals a problem, navigate to Settings > Sound > Expert Settings, and then select Reset Sound.
Next, let's check your firmware. Navigate to Settings > Support > Software Update. Update if needed.
If you are still having issues please contact us at 1-800-SAMSUNG, 8 AM - 12 AM EST, seven days a week. Or visit us on the Samsung website and click on the ‘Support’ link for:
1) LiveChat with an agent
2) Manuals, Software, & Warranty Info
^Brie