On Sun, 22 May 2005 17:44:43 +0000 (UTC), "Lewis"
wrote:

I have a Goodmans 19" (I think) CRT TV which is used mainly for gaming
(Xbox). If very light colours are displayed on it for much more that a
minute, the purity will start to degrade. Let's say a racing game is being
played, the car takes up most of the screen, and is light silver. After
about a minute, the right of the car will be pink and the left will be
green. This would suggest that it's magnetised by some external source but
a similar thing happens to the 21" downstairs, but less extensively. It is
not all that noticeable on most games/programmes but I have just bought a
game that has almost entirely white menus and within a minute the menu is
half red half green. As soon as darker colours are displayed, the
distortion goes away. Also, if a very still image is displayed for a while,
the same thing happens, even with darker colours. Switching off, degaussing
and getting the image moving again all make it fade away, but only
temporally.
Any ideas?

well it sure is NOT magnetisim, that would always pe present, i
suggest this could be shadow mask doming. This is localised distortion
of the shadow mask caused by the electron beam heating it.
see http://www.eio.com/repairfaq/REPAIR/...tml#CRTFAQ_027 for
more.

kev