I have been watching this (the 52") for a few days now since I set my color palatte to all colors nulled except for the +6 push on the magenta and the color seems consistently accurate on all sources OTA and DVD.
I remain convinced that the green cut is factory maximized at the service menu level and the color cannot be properly balanced by lowering the green slider on the user acessible color palatte (doing so seems to have no effect); however, the magenta 'push' does get it to a proper balance [See Edit 11/15/08 below].
I am eager to see if any one else here experiences the same difference with this adjustment.
Edit 11/15/08: I have watched a number of DVD's since I submitted this post (Note: I don't own a Blu Ray player or media).
In doing my "by eye color calibration" using my benchmark Sunday Night NFL football telecast (OTA), that telecast ended before I was completely satisfied with my result (+6 Magneta). So, I have continued the process using DVD's with which I am familiar. I could not completely compensate for the 'green cast' just using the Magenta slider so I broke the Magenta into its constituents of Red (+6 Red) and Blue (+6 Blue) and re-zeroed the Magenta slider (null (0)). This duplicated the effect of the +6 Magenta setting with all other color sliders set to null (0).
With the color hue settings now Red +6 and Blue +6 and all other sliders at null (0), including Magenta, I proceeded to 'walk' those settings up the scale while skewing the balance slightly more to the red constituent. Keep in mind that I had felt I was quite close at +6 Magenta and did not feel that the incremental change would be substantial. With each change I watched material for ~ 20-30 minutes before trying the next logical incremental change. Long story short, I have settled on +6 Blue and +8 Red as the only hue setting changes; all others remain at null (0).
I have watched a considerable amount of material from the HD OTA, SD OTA and assorted DVD's at these settings and am a very happy camper.
My two conclusions from this exercise are:
Firstly, there is a very definite OTB green shift that cannot be corrected by moving the green slider towards the left [-]. I have some trepidation about going into the service menu, but this is consistent with the settings from that menu posted by Solid-State. See his post #28 (G-Cut F6H). [NOTE to Solid-State: No, I don't think you 'accidently changed (this setting)']. It also appears to be classic Toshiba from all that I have read about the green shift in these threads.
Secondly, this can be corrected by adding the correct amount of Red and Blue in the user accessible menus (moving those sliders to the right [+]): [VIDEO | Colormaster (On) | Color Palette Adjustment | Select Standard Color (Red, Blue, Green, Magenta, Yellow, Cyan).
Edit 11/17/08: I checked the calibration against last night's NBC Cowboys vc. Redskins telecast. I think that confirmed for me the +6 Blue, +8 Red setting. Daytime football and golf telecasts under cloudy or hazy sunlight have noticeable color shifts toward the blue/cyan that I think is due to the nature of the light (higher in UV which is bluish). Certain commercials and some TV shows may also have a color cast with these settings, but most studio productions, such as GMA and the evening news, shows look 'right on' with these settings as do sporting events in sunny conditions.