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From: kurtk@tekcae.tek.com (Kurt Krueger)
Newsgroups: comp.periphs,comp.sys.ibm.pc
Subject: Re: Strange monitor problem (glow forming on monitor)
Message-ID: <5161@tekgen.BV.TEK.COM>
Date: 5 Dec 89 18:39:02 GMT
References: <7592@cognos.UUCP> <1337@cbnewsi.ATT.COM> <1989Dec4.160308.16001@sj.ate.slb.com>
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Reply-To: kurtk@tekcae.tek.com (Kurt Krueger)
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Organization: Tektronix, Inc., Beaverton,  OR.
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All sorts of stuff can cause a glow on a TV type tube.  Try checking for the
following:

1. Overscan.  The beam is striking the sides of the tube.  Adjust if possible.

2. Gas.  Turn the whole screen on.  If it is serious enough you will see a cross
   pattern.  Otherwise, if you can see the neck of the tube, check the "getter"
   material (the blackish, silverish spot).  If it has white fringes, you have
   gas.  Time for a new tube.

3. Junk/crud.  Some small piece of metal, glass, or phosphor has gotten near the
   the high voltage end of the tube.  Not much you can do.  You might be able
   to dislodge it by shaking the monitor but if there is loose junk inside you
   may make matters worse.  Don't get rough with the tube, they do break and
   are potential bombs.

4. Maybe all the smoke leaked out :-) .


________________________________________________________________________________
					|
kurtk@tekcae.CAX.TEK.COM (Kurt Krueger)	| Everything runs on smoke.  When the
  Electrical Simulation Group (ECAX)	| smoke leaks out, it stops working.
  Ex CRT designer                       |
    D.S. 59-432  (503) 627-4363		|
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