DIYbanter - View Single Post - Blue "bleed-over" on RPTV

wrote:
Is the blue tube projecting a sharp picture? Or are you seeing
bleedover caused by dirty cooling fluid?

I heard somewhere that the blue tube typically runs hotter, and the
cooling fluid clouds up and eventually degrades the image. Replacing
the fluid is not trivial but a lot easier and cheaper than replacing
and aligning the tubes.

I don't know why it would go away after warming up, unless whatever is
obscuring the picture goes back into solution when it's warm.

If the coolant is contaminated you get cloudy splotches normally and it
doesn't change as it warms. I would agree with the other diagnosis that
the blue tube has gone weak, though it wouldn't hurt to have the
emission checked as it's possible there's something else wrong. It also
may be possible to reduce the brightness of the other tubes to get a
decent white balance without the blue clipping.