Originally Posted by XFistsClenchedX
Turned on my tv today and it decided that it would run the Store Demo and completely ignore all inputs, including all buttons on the television, except the volume buttons on the remote work. Aside from that, I can't change anything right now. It is currently unplugged and if I plug it back in, it turns itself on and repeats what I just mentioned. A warranty repair may be in my future. I'm not a knowledge person about stuff like this, but I'm guessing that it is some sort of motherboard that is frying/fried. The other thing I noticed is that it now plays the melody when you fire it up, even though I had turned it off previously.
XFistsClenchedX try these rough instructions to pull the TV out of demo mode:
1. Set the source to TV. (Necessary menu choices don't show up otherwise)
2. Hit menu, go to setup, and select Plug and Play.
3. Go through the Plug and Play prompts, selecting Home mode when prompted. Skipping some prompts (ex: time) is ok, but don't quit this process.
My set would randomly turn on into demo mode occasionally. It slowly got worse, and the set ended up refusing to power on in an endless fail to power on from standby, power off, and repeat loop. This was a bad power control board inside the set.
Samsung gets lots of faulty ones: my original was bad, the replacement board sent to the tech was bad (found during service), and the third one seems to be working a little. The tech managed to bust my panel in the repairs (lots of new noise, bad color, banding, and burn-in immediately after he installed parts; pristine picture quality before), and they wanted to try replacing the panel. I screamed at Samsung enough on the phone to avoid the fourth service repair.
They are replacing the set with a PN50C6500, but it will be 1 month without a properly working TV after the whole ordeal. I hope you have a better experience than me-- I won't buy a Samsung consumer product again.