For me and my 520, both Phase's and csamos's settings come out entirely too yellow. Whites look yellowish white - not even close to neutral. If yours are coming out the same way I would reccomend resetting the input to the defaults. Set your color temp to "Medium" and use the free AVS HD709 disc to calibrate a proper contrast/brightness/tint/color.
Thats been my solution until I can snag a colorimeter to calibrate myself.
For instance if "Sport" picture mode is selected, with Backlight 30-43,Contrast 82-90, Brightness 45-55, Color 50, Tint 0; and check it against csamos or my Expert COOL BD550 settings on a standalone DVD or Blu-ray player; the picture will be much more natural. If you set the color temp to Medium it gets way too blue.
Many times it it a cable box, game system, computer graphics card ,etc that may skew color temperature or picture settings also.
LG 42LD550 HDMI 1 Input ISF EXPERT2 LG BD550 Cool 2-7-11 Usable Range.txt 1.4580078125k . file