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Article #6474

Comp monitor high voltage out (& Re: Computer monitor)

#6474
From: Rick Stuart
Date: Thu, 27 Aug 1992 17:46
40 lines
2188 bytes
In article <ssomaroo.714255819@unpcs1> ssomaroo@unpcs1.cs.unp.ac.za
(Shyamal Somaroo) writes:

>I used to own a Commodore 128 computer and had a monitor for it.
>Now I use the monitor as a television screen and wonder if it
>is possible for me to use it with my CGA card since I have a black
>and white screen at the moment.

Sounds like your Commodore monitor accepts composite signals, the CGA
card produces RGB signals.  To turn RGB into composite, you need to
build a modulator (Trivial if you have the parts and know-how, other
wise not worth it, *I* think.)  Besides, used CGA monitors should run
less than $100.

>Also if it is possible could I use it with a VGA card and if so
>how do I do it?

If you are using it as a TV monitor, it runs at about 15kHz.  VGA monitors
run at about 35kHz.  Trying to run your Commodore monitor at this speed
might shorten it's life to a few moments!

______________________
On to *my* question...

I have a Teknika CGA/EGA/PGA (almost VGA) multisync monitor (MJ-503).
The other night the high voltage died (or so I assume).  What advice do
*you* have for me.  I'm looking for feed-back like...

"Capacitors sitting between the fly-back primary and the power
transistor oscillator are the first to go."

                                ...or....

"Have you examined the case of the conversion diode between the
fly-back and anode of the picture tube?"

If the feed back is good, I'll collect and post them!

                                ...thanks, Rick Stuart
                                           Lisle, IL
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From: stuart@tellabs.com (Rick Stuart)
Newsgroups: sci.electronics
Subject: Comp monitor high voltage out (& Re: Computer monitor)
Keywords: monitor high voltage computer
Message-ID: <1992Aug27.174644.1074@tellab5.tellabs.com>
Date: 27 Aug 92 17:46:44 GMT
Sender: news@tellab5.tellabs.com (News)
Distribution: usa
Organization: Tellabs, Inc., IL
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Originator: stuart@sunc19
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