AVS Special Member
Join Date: May 2008
Location: San Francisco - East Bay area
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My guess would be that the LG TV disables CMS for any RGB input. If you change your disc player to RGB you may lose the CMS also. If you change the PC to output YCbCr, the CMS controls may become available again.
You might also lose the Color and Tint controls when you send an RGB source. Usually, the TV cannot process video in RGB mode... the video has to be in YCbCr mode for processing to work. But there are plenty of TVs that convert RGB to YCbCr automatically and Color/Tint and CMS controls remain active. By sending RGB you may add a conversion step that's really unnecessary (extra conversion steps can cause slight image degradation) if the TV does NOT convert the RGB to YCbCr, it is common to lose Color/Tint and CMS controls.
"Movies is magic..." Van Dyke Parks
THX Certified Professional Video Calibration
Widescreen Review -- Home Theater & Sound