Hello, everyone, thanks for the great thread. I just bought a used PN51F5300 and everything looks great with Dan's settings, except for two issues that are bugging me.
1) When the screen is transitioning to something and there is black displayed (e.g., you load a blu-ray and it goes to black while it spins the disc), there are faint grey horizontal bars that show up, but they aren't visible when the actual movie is playing during a dark scene. I got closer to the screen to take a look and there is some static-looking fuzz going on. Not sure if this is normal or not.
2) While investing this issue, I paused a blu-ray and got close to the screen and there were little white speckles randomly alternating throughout the screen, but they are totally not noticeable at all from a short distance. The movie had black bars on the top and bottom and those had no white speckles, just the actual movie frame. Again, not sure if this is something specific to plasma or PenTile displays (only owned LCDs), or a defect.
Neither of these is terrible as I got a great deal on this TV, but I'm just curious.
Edit: After more reading, I think #2
might be "dithering noise" which is apparently normal.