Re: Another sick computer monitor

["Bernard G. Cleyet & Nancy Ann Seese" <georgeann@REDSHIFT.COM>]

Doug!

Each time one  powers up the monitor, ac is run through (pardon my anthropomorphism) a coil surrounding the face plate.  It uses a thermistor (at least the old TV models I dealt with did ) to give it a
long decay TC and then stay off 'till one  turns off the monitor.  From your description, I don't think it was (is) shadow mask magnetization.  Why do you think it is? Have you tried a magnet to see its
effect -- One possibility?  If somehow dc got into the coil -- no the mask still wouldn't be uniformly  magnetized that way.  Here's another thing to do.  Get a magnifier, ~ 10 X  e.g. linen tester, and
look at the individual "dots" in various places.  That may give you a clue.


bc

P.s. ".... without MY doing anything. except ...."

Doug Craigen wrote:

> "Bernard G. Cleyet & Nancy Ann Seese" wrote:
> > This is strange. However, I think JH may have the answer.  If only blue were black, it'd obviously be that the blue gun's heater had "burned out", or it's amp, connections, etc. had "broken."  But to
> > get white at any time means you've got the blue "working."  So you may have a short in the cable.  Though I can't immediately see how a combination of shorts and opens will give your result.  When it
> > was flipping (yesterday), were you moving anything?  I fear that it's not simple, and is in the RGB control circuits.  Forget about degaussing - bring a magnet near the screen and you'll see that a
> > magnetized mask produces a completely diff. effect.
>
> No I was not moving anything, it was just sitting on the desktop.  As
> year or so ago I had degaussing problems where the entire screen was a
> purple tinge. I eventually got it to go away with a routine of leaving
> the screen off for a few minutes then turning it on for a few seconds.
> Before discovering this though, the degree of tinting would often change
> suddenly with a flicker - often to almost correct colors but then fading
> back.
>
> The problem I had a couple of days ago was a bit reminiscent of this,
> the screen would just flip states suddenly without me doing anything
> except sit there working.  It probably went back and forth about 4 times
> during the day that I saw.
>
> \_/~\_/~\_/~\_/~\_/~\_/~\_/~\_/~\_/~\_/~\_/
>
> Doug Craigen
>           http://www.dctech.com/physics/