No red in picture. I have a Phillips Tv, 55 inch projection hdtv, approximately 5 years old, but

Question

I have a Phillips Tv, 55 inch projection hdtv, approximately 5 years old, but with only about 3 years of use on it. A few weeks ago the picture began to lose its red color intermittently, now the picture has no red at all, but it does continue to flash red lines here and there. Any ideas?

Thanks!
Holly