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From: bender@oobleck.Eng.Sun.COM (Michael Bender)
Newsgroups: sci.electronics
Subject: Re: sort of fixed monitor
Message-ID: <2262@exodus.Eng.Sun.COM>
Date: 7 Nov 90 01:18:53 GMT
References: <1990Nov6.233222.8908@nntp-server.caltech.edu>
Sender: news@exodus.Eng.Sun.COM
Organization: Sun Microsystems, Mt. View, Ca.
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In article <1990Nov6.233222.8908@nntp-server.caltech.edu> gwoho@nntp-server.caltech.edu (g liu) writes:
>i had an amiga monitor that quit working after 4 years of being on,
>so i took it apart and tried to fix it.
>it turns out that a strange looking temperature sensitive resister thing
>went bad.
>this is wat it was for: when the computer is turned on, the resistor
>is cold, so it lets lots of current go through a coil that is in front
>of the crt. after 1 sec, it gets hot, and the current shrinks, and it
>demagnitizes the metal chunks around the crt.
>the resistor was shorting, so i got rid of it. but now,
>the screen is a bunch of strange collors. how could i make it good again?
>also there is quite a big scratch on the screen. is it possable to fix it?
>thank you in advance for sugestions.
>gwoho liu.

I can't help with the scratch, but for the resistor, you could try
substituting a momentary push button switch, optionally with a fixed-value
resistor in series with the switch if the miniumum reistance of the original
resistor was much greater than a few ohms.  Another trick might be to build
a one-shot and use that to drive a relay, so that even if you held the push
button down, the one-shot would limit the amount of time that the degausser
coil was energized.  Of course that wouldn't stop you from continually
pushing and releasing the switch, but then again you can break anything if
you try hard enough.

I suppose that you could also buy or borrow a TV degaussing coil and run that
in front of the crt.

mike
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