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Posted by Steve Roberts on 11/01/06 14:30
On Sun, 29 Oct 2006 15:48:20 -0700, Beowulfie <enigma@hotmail.com>
wrote:
>Today I noticed two large spots, one bluish and one greenish, on the
>screen when I started to watch a new dvd. I turned to the regular
>channels on the tv and they weren't there. When I switched back over to
>the tv they were back, after abit they were gone, but then little later
>they came back.
It sounds like a heat related problem, causing the shadowmask in the
tube to warp slightly and allowing the green phosphor pixels to "see"
a bit of the red and blue electron guns and vice-versa.
Quite often this is because the TV is set by default with its contrast
flat-out. This causes a very bright image, but produces more heat and
thus more potential for warping. It will also mean that the beam will
be less focussed and produce a softer picture and a shorter tube life.
Try turning down the contrast to something sensible (like halfway) and
see how you get on.
Steve
The Doctor Who Restoration Team Website
http://www.restoration-team.co.uk
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