My Samsung (2 month old) P42B450 just moved WGBH Boston, 2.1, over to 19.3
I surfed and discovered that ch 19 is the digital channel that GBH is broadcasting on. I'm not sure why it is not getting shifted back to 2 like before. I also notice that a firmware update was released by Samsung yesterday but it is for a minor unrelated issue so I won't try the USB update thing right away. I'll wait a while before trying anything. OTA DTV has been an evolving paradigm. Channel 7 WHDH has been messing with my TR40 converter since day one.
Anyway, you are not alone, if that helps much.
We've had our Samsung LN40B530 for 3 weeks now and it's worked fine. Today one of our channels (ch 2 WGBH) dropped and is now showing up at channel 19. Our other tv is still getting channel 2 on channel 2. What's up with that?
We have a roof-top antenna. The tv is not on demo mode. I've rescanned several times. When I enter channel 2 it is snowy and says weak signal. So why is it showing up on 19 which I never got before?