In many cases, this is a result of a HDCP (copy protection) issue with HDMI cables. What is likely happening is that the either the cable box or satellite box doesn't recognize the television as an authorized device, and therefore it stopped sending the picture signal while the audio continues.
This can be common. To fix this, try unplugging the cable or satellite box, and plugging the unit back in. Sometimes a simple reset will be enough to reset and fix the issue.
If this still doesn't help, you may need to contact the Samsung customer service center at 800-SAMSUNG for further troubleshooting and assistance.
Last night while watching TV, my screen simply went blank.
I could hear sound but no picture.
I unplugged the TV for a bit and plugged it back in, still blank. I notice a flashing yellow light coming from one of the boards inside the TV. Not sure if this light always flashes or it indicates a problem.
Is there anything else I can try before calling a repair person? With the prices of TVs these days is it even worth paying to get repaired?