own a 2001 4:3 Hitachi 50" (50DX10B). During last hockey season i noticed near the center of the screen a light brown smudge spot. Not uniform, looks like a spill. Tried cleaning the screen and used S&V to calibrate again, but it appears to be burn-in or something.

I've read many posts and see some who had bug droppings on a tube.

Any ideas? Should i try to open and clean the tubes?

If the screen isn't white, it can't see it....but for hockey, it sucks!

Anyone ever opened a RPTV? Any other tests to verify burn-in?

Gotta get ready for next season.

TIA