Please Help. My 3 yr old Philips HD projection tv, 30 days past warranty, started displaying all of a sudden a yellow half moon at the top of the screen, along with blue or yellow shading along the edges of objects, while lettering has a blue curved double image. A week later the yellow circle started appearing also at the bottom of the screen, though the tv has to be on for some time for that to occur. Reading some of these posts led me to think it was a convergnce problem. The tv has a button to push to automatically correct convergence. Tried that several times, did not help. I would appreciate some idea of what is wrong so that when I call a repairman, I won't be taken advantage of. Guesstimate for repair cost? All help appreciated.