Originally Posted by zamine
thank a lot you for this very useful response and clarifications
that's confirm what i was thought, even my PA43H4500 Is "A" version, it has poor blacks and it's due perhaps like you said to the H panel but is that mean that the others H4500 or F4500 use another panel version ?.
i tough that there is no panel lottery with samsung plasma TV and that they are all manufactured by samsung but if my set in not faulty one it's clear that bad quality plasma panels are used in some H4500 tvs.
Do you know which version is your F4500 and have you checked before the panel version ?
Im having a tough time believing that it has anything to do with "panel lottery". Being a newer model, the H4500 should at least equal the F4500s performance. I have 2 F4500s (A and B rev) and a B rev F5300 and they all have extremely similar color reproduction and black levels (at least as far as I can tell by eye). Im much more inclined to believe that either there is an issue with your source (like whether its set to full or limited range color, etc) or the settings you are using.
It really, really sounds to me like your connected device is using limited range color (16-235) while your set is expecting full range (0-255). Remember, HDMI Black Level Normal = Full range, HDMI Black Level Low= Limited range. If your connected box is using YCC colorspace, then the HDMI Black levels should be greyed out, if thats not the case, you definitely need to make sure you are using the correct settings here.
Can you please post pictures of your problem and a detailed list of the settings you are using? Assuming you havent changed the settings on the second HDMI port on the TV, try plugging into that one-- see if the problem is the same.
You might also try to go to the system options and reset everything to defaults, then turn off Eco mode, reduce your brightness to 43 and set your cell light to 14. Use standard preset mode with standard color temp.
Have you tried different sources, such as a PC or Blu-Ray player?
Below is a good write up (composed for Xbox 360, but applicable to all A/V equipment) on colorspace and full vs limited range RGB...