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SGIforever
Joined: 06 Jul 2009 Posts: 66 Location: Sweden
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Link Posted: Tue Jun 19, 2018 12:47 pm Post subject: How do I view a 15.75kHz video signal? |
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Hi,
This is not exactly a CRT projector problem, but I hoped someone could help me anyway or put this
in the correct forum
I have an old machine with a CRT monochrome monitor. The circuit for the vertical deflection is bad
because I only see a green line on the black background. The green line changes when I press buttons
on the machine so there is a video signal trying to display my actions.
There is also a mini coaxial monitor output on the "graphics board" where I should be able to connect
an external monitor. I think the signal is 15.75kHz and I wonder what kind of monitor I could connect to
that signal. I have old multisync VGA CRT monitor, some old tv-monitor and maybe I can dig up something
else if necessary.
I also wonder that kind of cable/adapter I need to create to connect the monitor.
I think the machine is trying to display an error code and I would like to know that error code.
Any help would be very appreciated.
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Curt Palme CRT Tech
Joined: 08 Mar 2006 Posts: 24305 Location: Langley, BC
TV/Projector: All of them!
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Link Posted: Tue Jun 19, 2018 1:57 pm Post subject: |
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You need an old composite video monitor. Most later model old CRT TVs had a video input, or an old CRT security TV monitor would work fine. I agree though, get the V deflection working and it should come back to life. Change the vertical chip, and all the electrolytic capacitors in the vertical section to start with.
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Tim in Phoenix
Joined: 21 Oct 2006 Posts: 4379 Location: Phoenix
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Link Posted: Tue Jun 19, 2018 2:14 pm Post subject: |
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If you have a projector that runs 15khz and takes sync on green, just cable that to green.
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jmetal88
Joined: 06 Apr 2017 Posts: 108
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Link Posted: Tue Jun 19, 2018 3:33 pm Post subject: |
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You could probably hook that output up to any old TV with a composite video input as well (although the picture won't be as sharp on a color set).
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