Hello irepaired tv's,stereos,vcr's for 15 years. i just repaired my zenith rear projection convergence problem. had to replace the blue convergence amp,had foldover.i would like to find technical info on rear projection technology.i sold my tv repair 20years ago,i serviced tv's 15 years.i understand some of the new technology,just want a little more information. thanks for a reply,edwad