HItachi convergence problem - blue only

Hi, I have an Hitachi 51F500 projection TV. I appear to have a convergence problem of some sort. The blue is off by quite a bit. I tried magic focus and manual convergence w/ no luck. When I unplug the component input b (of rby) I get no effect. When I uplug the others, the colors change. almost like the blue input is not registing into the TV. Same problem w/ DVD input and Dish input so I think it is a TV issue.