Originally Posted by Pabgon
Did you change the contrast default setting in the service menu? and when you say "I didn't see a back light change, dependent of light condition"... are you referring that you didn't see the floating black issue after making the contrast change?....
As for CATS with flash light... I only got mine to work when it was enabled.
I thought that once you disable CATS it would be disabled Globaly. Which was a bad assumption.
You can make the tv trigger the floating blacks by having a high Contrast value in the user menu. Though you may not see the tv use the high contrast until a scene using bright details. Once that scene comes up on the display, low power mode is replaced with normal mode.
It is part of the Energy concervation design, why have the TV push all the high contrast all the time. My DLP has a Dynamic Contrast that works very similar with the same results, floating blacks.
Yes, I made sure to disable it long ago... though Panasonic does not have a disable function in the menu. Makes you wonder what Panasonic was up to hidding Dynamic Contrast within CATS or it was just by freak luck with power managment.
Ok, let me explain a bit... there is soo much that I did that may have confused you.
Originally I saw the changing black levels when I started to calibrate after my burn in.
I saw them as I started to do the brightness and contrast on the grayscale bar image.
I noticed my brightness would boost or blacklevel would change as soon as I got past 65 on the contrast.
I thought since the TV was low end from Panasonic that it used outdated controls on the Brightness and Contrast levels. DVE kinda led me to that when viewing the instructional video.
After some diving into the internals and reading so many threads... I soon realized after a tweak with the Service menu that I can lower the initial contrast level so that the tv will not trip the low power mode into full power condition for bright viewing.
So with the few days of messing around from all the different ways to disable CATS, I realized that CATS is just another triggering system to put the tv into high gear so to speak.
I will be updating my information to give my numbers as a guide to show how much a difference lowering the intial value to the Contrast level set in the service menu.