Hello,

Thank you for choosing Samsung’s QN990F TV. Black bars may appear depending on the original format of the content you’re viewing:
• Black bars on the sides are common when HD channels display upscaled SD (4:3) content
• Black bars on the top and bottom occur when watching films shot in wider aspect ratios than your TV supports

To adjust how content is displayed, you can try changing the picture size settings on your external device or on the TV itself: Home > top directional key > Settings > All Settings > Picture > Picture Size

Please note: Not all content can be stretched or zoomed without distorting the image.

If your TV is displaying lines on the screen unrelated to content aspect ratios, we recommend the following steps to help isolate the issue:

1. Check all input cable connections for any external devices (e.g., HDMI, streaming boxes, Blu-ray players)
2. Switch channels or inputs to see if the issue appears across all sources
3. Run a Picture Test to check for panel-related issues: Settings > Support > Device Care > Self Diagnosis > Picture Test
4. Perform a cold boot by holding the power button on your remote for about 10 seconds
5. Ensure your TV has the latest software installed: Settings > Support > Software Update

If the issue continues after these steps, the TV may require service. For further assistance, please contact Samsung Support at 1-800-SAMSUNG (8AM – 9PM EST Mon – Fri, 8AM – 6PM Sat – Sun). LiveChat and additional support resources are also available through the Support link on our website.

~ Samsung Pro