here is some update to the problem that the leds on the left side don't light up:
Today I had some time to observe and analyze the problem a bit more.
First I have to cancel the statement that the problem is dependent on a single channel. It is not. Furthermore it seems to be dependent on the content. Movies and commercials do work well as there are fast changing pictures with many different colours. TV shows with static cameras and static backgrounds suffer more often from the problem.
It seems that if the left side of the screen mainly consists of a steady, not very bright colour that the leds switch of. To light them up again, a bright colour spot surrounded by high contrast has to appear in the area. It looks like the range of brightness has reach some spectrum to activate the lights again. As long as the lights stay on a constant level (which in my view by far should be enough to let the leds shine, and it does that on the others sides of the screen) they stay off.
If you play with the settings, like minimal brightness the results differ. For min. brightness=0 the effect is as stated. For min. brightness 0.1 and above lights on the left stay on but loose their colors for sceenes described.
Does the grabber have any threshold (e.g. for detecting blackbars) which has to be exceeded for one side or a specific area to put the lights into action (again)? That might be the only explanation I could imagine... If, is there any chance to deactivate that and test again?
Picdumps still don't work as I wrote some posts ago, but I will try to make some video to help you get an impression.
thx & greetz noway42