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To work on a VGA monitor,
Submitted by Mark on August 6, 2007 - 2:49pm.

I don't think this will work. I believe most of the VGA monitors today have circuitry to ignore strange h-sync and v-sync signals.

You could make a circuit to provide dummy 60Hz/31.5kHz clocks to the monitor, and put voltages on the color pins, to produce a solid colored screen. Then, you could clip the wires going to the coils and run those to an amplifier to make it a scope.

The CGA monitor was easy because when you fired it up, it had a blank screen by default. It must generate it's own h-sync and v-sync without the assistance of a computer.

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