Hi Silver,
Thanks for sharing your experience with your U7900 TV. Unusual sounds can come from different sources, so first check whether it’s from the TV speakers, an external device (like a soundbar), or the back of the TV.
• For external audio, ensure cables are connected to the correct output
• If using antenna or cable, check signal strength: Settings > Support > Device Care > Self Diagnosis > Broadcast Signal
• Popping sounds from the back may be due to thermal expansion - this is normal and not a malfunction
• Run a Sound Test to troubleshoot: Settings > Support > Device Care > Self Diagnosis > Sound Test
If the issue continues, please contact Samsung Support at 1-800-SAMSUNG, 8AM – 9PM EST Mon – Fri, 8AM – 6PM Sat – Sun, 7 days a week. LiveChat and additional support resources are also available through the Support link on our website.
~ Samsung Advisor