Toshiba 1994 vintage 55" projection convergence

I haven't been able to figure what "service menu" means. The front controls RH/BH and RV/BV won't bring the crosshairs in, and the picture is "3D" with a bottom rainbow like so many other questions. Sounds like a new TV recommended? I'd like to try something myself as I don't want to spend $300-$400 for service which may or may not work. Is it feasible for a novice to align or replace something? I also heard the term "convergence amp". Can I replace that myself? Thanks if help can be had. LD