Hi Mel,
If you're not hearing sound from your U8000F TV, please try the following:
• Check your volume and mute settings, and confirm external speakers are powered on.
• If using HDMI ARC/eARC, make sure you’re using a certified HDMI cable and go to: Settings > All Settings > Sound > Expert Settings > HDMI eARC Mode = Auto. Also enable Anynet+ (HDMI-CEC) under External Device Manager.
• For Bluetooth, try unpairing and reconnecting: Settings > Sound > Sound Output > Bluetooth Speaker List
• For Wi-Fi speakers, use: Sound Output > Wi-Fi Speaker Surround Setup and make sure both devices are on the same network.
You can also try running a Sound Test: Settings > Support > Device Care > Self Diagnosis > Sound Test.
If your issue continues, we’re happy to help at 1-800-SAMSUNG, 8AM – 12AM EST, 7 days a week. Our LiveChat agents are also available by clicking the ‘Support’ link at Samsung.com.
~Samsung Advisor