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From: kevind@pogo.WV.TEK.COM (Kevin Draz)
Newsgroups: comp.sys.mac.hardware
Subject: Re: Thin horizontal line
Keywords: RGB monitor
Message-ID: <9781@pogo.WV.TEK.COM>
Date: 11 Sep 90 03:01:20 GMT
References: <1786@gazette.bcm.tmc.edu>
Reply-To: kevind@pogo.WV.TEK.COM (Kevin Draz)
Distribution: usa
Organization: Tektronix, Inc., Wilsonville,  OR.
Lines: 22

In article <1786@gazette.bcm.tmc.edu> hmayor@watson.bcm.tmc.edu (Heather Mayor) writes:
>
>I'm trying from another port!  There is a thin horizontal line
>about 1/4 way up from the bottom of the screen on my high resolution
>Apple RGB monitor.  It's always there even against my desktop
>pattern.  Is this a defect and should I do anything about it.  I've
>only had the monitor about a month.  Any ideas?
>HDM (hmayor@bcm.tmc.edu)

All Sony Trinitron monitors have a thin wire across the shadow mask (they
call it the slot grid).  This wire helps keep the tension on the metal rungs
as they dissipate heat from the electron guns, which prevents them from
distorting.  If they didn't have it, you'd see unpure colors, varying as the
image changed.  You can see this thin wire if you look hard enough at any
Trinitron, Apple's or otherwise.

Other picture-tube designs do not need a wire, but then again they do not
always perform as well as the Trinitron.  It is a trade-off, and a
inconspicous one at that.

Look at someone else's Mac, or go to the dealer you bought it from.  The
demo's have the same thing.