my 10 year old zenith has no green or yellow colors and i took the housing off, found 3 colored adjustmentometers(how do you like that description) on the board on the pic tube. all except the green one(p#R5105) make changes in the color(ex. blue and red changed the colors) would this be the problem or would this part not work because there is no green color to adjust? the rest of the pictue is fine, any help would be welcome