I think I'm right in assuming I have a CRT rear projection tv? I received a hand-me-down tv which is quite a few years old (I would guess 7-10). I really appreciate the gift but I seem to have an issue with alignment of the "color tubes"....excuse my ignorance. My question is, is there anything I can do myself to get the convergance back in order. I've gone through all the screen menus but don't see any options. The model is a Mitsubishi VS-50VA2 if that helps at all. I really appreciate any help that can be given. Thanks in advance for any help.