I just replaced my Samsung 61A650 with a Philips bulb. On occasion, when there is a lot of white on the screen the entire picture will kind of shift warmer, like yellowish shade. I goes right back to being fine but it's annoying. Can a bum bulb cause this? It actually happened on my Xbox once as well on another HDMI port so I know it isn't one device causing it.
Since no one has any better ideas, I would unplug the tv when it is off, leave it unplugged for a while, then plug in and boot it up, in case you've just gotten stuck in some software glitch.
I would also go through the menu and turn off any artificial picture effects like Dynamic Contrast and Edge Enhancement etc in case they are causing your problem.
Also try inputs other than hdmi. Also see if the flicker affects the menu screen. Try a different hdmi cable.
Hey, just saw this. I actually just put in a replacement bulb. I do have Edge Enhancement off, I will check DC. Hopefully it was just a bum bulb. Other HDMI inputs also had the same issue but only after switching bulbs. Hopefully it is ok.