Re: Serious Val Problem with Panasonic TH-42PX75U plasma

[Anonymous]

If it wasn’t clear, I did set black level using 0% and checked it with 10%, 20% and 30% to see how it held up… it was OK throughout.

The black level only jumped up when you displayed something that “pushed” the panel a bit like the 100% window at 29 fL or more. If you adjusted the Picture control 1-step at a time, there would be a 1-step increment that would cause the black level to jump way up. I ended up using the 100% window to set the luminance to 26 fL to make sure the panel stayed below the threshold where most of the shifting of the black level would not happen.

But that left me with Gamma at 1.65 in Custom mode and 1.85 in Cinema mode.

The numbers you mentioned were about right for getting rid of the red tint to the 10% step. I got that under control with no problem.

My only problem is that as good as every other measurement is after the calibration, Gamma is 1.65 for Custom mode, and 1.85 for Cinema mode. And there are no User controls or service menu controls for Gamma.

It appears that the only alternative is to put the panel back to the previous settings (where Gamma was 2.4 or 2.5) and leave all the other errors that I “fixed” with my calibration. My gray scale was much better than his – it was actually excellent with very low dEs. So it surprised the heck out of me when Gamma measured as low as it did. But he’s obsessed with the low Gamma. Before the calibration he was obsessed that the 10% step had red in it and that his black levels floated. I got rid of both issues, only to get hammered with the low Gamma.