I've had this TV for about a month now, and decided I'd give it a go calibrating it tonight. I used an i1 Display 2 for my meter, ColorHCFR for the calibration program, and the AVS HD 709 disk for the calibration patterns. I used an LG BD550 hooked up via HDMI to run the patterns. Gray scale calibrated nicely with the controls available in the service menu. Unlike others who have posted, I adjusted grayscale under: adc/wb -> adc result and then adjusted the following to:
(to adjust the low end of grayscale)
2nd offset R: 109
2nd offset G: 113
2nd offset B: 109
(to adjust the hight end of grayscale)
2nd gain R: 146
2nd gain G: 144
2nd gain B: 149
I also set the picture settings in the main menu to:
Picture mode: Movie
Color Tone: Warm2
Screen Adjust: Screen Fit
Digital Noise Filter: OFF
Energy Saver: OFF
This TV is in our bedroom, so it is viewed mainly in low light and was calibrated that way. If you view in a bright room you might need to boost subcontrast in the service menu to your liking.
The controls are limited for dialing in primary and secondary colors. The TV doesn't provide a way to adjust the luminance and tint of each color separately. You can only adjust the Color/Luminance of all colors at once, and the Tint of all at once. However, even with the limited controls they are not too far off.
There are a few quirks with calibrating this set however. The picture switches to dynamic mode when you are in the service menu. So if you use a meter you need to take your readings outside the service menu, mark down what you need to adjust, and then make the adjustments in the service menu. Rinse and repeat until you have proper grayscale.
Attached are screen caps of different measurements of the TV within ColorHCFR.
Here are my settings for gray scale in the WB section of the service menu. They are all at defaults, but I think they are different from the defaults posted earlier. Maybe each set has a different set of defaults? Either way, I thought I'd add them as well for the full settings in the service menu.
Sub Contrast 128
Sub Brightness 128
Calibration Files.zip 331.310546875k . file