Sorry to hear that you're having these issues.
Have you tried using a different HDMI cable to see if that solves the problem?
You have done exactly what I probably would have recommended you try first. Unfortunately, this doesn't seem to have fixed the issue. Often times, picture black out is a symptom of the digital signal being interrupted. When this happens, both the audio and video will stop displaying. I don't believe that this would be an HDCP issue, since both your audio and video are going out at the same t.
If you are able to determine that it is the television, you might want to try calling 800-SAMSUNG to see if you can get a repairman to inspect your television.
Keep me posted.
Hi folks..........Just got my LN52B750 LCD TV the other day along with PVR. Love it!!!!! I cant imagine a better picture. But.....have a problem. every so often, it seems mainly on a HDTV channel but not a 100% sure as I mainly watch HDTV. Its a cable signal. Every now and then, the picture goes blank, no sound, no nothing. I called the cable provider, they did extensive tests on their end, reloaded the software etc, they could not fault the box. The power light on the TV stays off, indicating no power interruption, the little light under the logo never goes off.The PVR lights, channel indicator stays lit so there is not an electrical power interruption. I tested it all day yesterday by watching DVD's all day, no problems. What does Samsung think? Other than that annoying glitch I LOVE this TV. I was going to go plasma until I just happened to walk in a store that had the LN750 next to a similar quality plasma and to me, the guy paying for it and watching it, the picture was superior, therefor I bought the LCD. Hope someone can suggest a fix for this small yet annoying issue.