I have been trying to calibrate a friends Toshiba 40vr525rz LCD panel. The set has less than 1200 hours on it, he's owned it since new. I can get the RGB grayscale to track at dE of less than 1.5
from 10 to 100 IRE. The average gamma is 2.2, but has a slope going up from 10 to 90 at 2.0 to 2.4 and tracks poorly from 70 and up. The luminance chart looks pretty good. I've set the brightness so I can see a 1% window, and the contrast to the point where the RGB balance at 100IRE is just below a clip. The back light is set to put out 42fL.
The set has gains for red green and blue, and drives for green and blue only, so the gamma cannot be changed much from where the red tracks. There is no CMS, just a color and tint control. All enhancements are off. The gains are part of the service menu, and are available for the 3 preset color temps, cool, normal, and warm. There is not much else to adjust in the service menu.
The shadows on the picture when watching any content are red to a degree, most notably on faces. The only way I have found to remove this is to set the brightness so high the picture washes out badly. The backlight, and contrast controls have little to no effect on this. Moving the gamma control to a point where it measures 1.6 seems to get rid of most of the red. The dynamic contrast control will correct the shadows, but it makes a huge mess of the gamma, from 2.2 at 10 IRE to .96 at 90 IRE.
I'm using an i1d3 pro and an i1pro rev d, HCFR, and the AVCHD 709 disk played on a Panasonic blu-ray player.
Has anyone come across this problem, or this set in particular? Any ideas on how to minimize the discoloration in the shadows? The set is all my friend can afford at this time, and I would like to be able to make the best of what he has.
thanks in advance