If you go into the menu and turn Peak White to zero this will turn off the white segment. Try Guy Kuo's spoon trick to verify. Hold a large silver spoon about a foot or so in front of the lens, waving it back and forth as fast as you can. You need to project a white image while doing this (IRE 100 screen on the AVIA calibration disc is a good place to start). With peak white off you'll see the three colours plus black. With it on you should see the three colours plus silver.