Path: utzoo!mnetor!tmsoft!torsqnt!news-server.csri.toronto.edu!rpi!usc!apple!agate!mindseye!izumi
From: izumi@mindseye.berkeley.edu (Izumi Ohzawa)
Newsgroups: comp.sys.next
Subject: Re: Teeny black speck on monitor
Message-ID: <1991Apr7.222453.17275@agate.berkeley.edu>
Date: 7 Apr 91 22:24:53 GMT
References: <1991Apr7.174834.14313@menudo.uh.edu>
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In article <1991Apr7.174834.14313@menudo.uh.edu>
 matt@karazm.math.uh.edu (Matt Emerson) writes:
>My MegaPixel display seems to be developing some flaws. Small flaws, but
>nevertheless noticeable and annoying ones.  These flaws are very small
>black specks -- it looks as if they're not even pixel-sized, so I'm pretty
>sure it's not VRAM or anything.
>
>"What a whiner!" you might exclaim, and perhaps you would be right. But the
>worst of the two or three specks is in the prime real estate in the middle
>of the screen. I always have some window in the speck's area, and being

Do the spots appears to be etched in the phospher and
do not change pattern from one power-up session to another?

Sounds like a severe phospher burn caused by stationary electron
beam.  This might happen if the high voltage for the CRT is
not turned off quickly enough before the horizontal and vertical
scanning are lost on power-off.

In normal CRT displays this should not happen, and I think you
have every right to expect the problem fixed, which probably
requires replacing the display itself.


Izumi Ohzawa             [ $@Bg_78^=;(J ]
USMail: University of California, 360 Minor Hall, Berkeley, CA 94720
Telephone: (415) 642-6440             Fax:  (415) 642-3323
Internet: izumi@violet.berkeley.edu   NeXTmail: izumi@pinoko.berkeley.edu