NO color

I have a GE Color TV (AB/AC Chassis) that has a perfect Black and White picture but NO color. So far I replaced the IC300 Color IC and that did not help. I did that because I saw no color signals at the 3 output pins of IC300. I hooked up a color bar generator for test purposes and see there is color signal getting to the input pin of IC300. I resoldered many griplets and that did not help either. Anyone have any further clues as what to look for? I suspect that the problem is somewhere near IC300.