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Samsung MA2565 Amber Monitor

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First post, by Rhoffman

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Hello everyone,

I have a samsung Ma2565 monitor that I am trying to fix. Someone at some point clipped the power and video cables (scrappers maybe?). I replaced the power cord and turned it on. It had a raster screen and everything looked O.K.
Then I went to figure out the video cable. I found the pins for the H-sync, V-sync, intensity, ground and video. But, the connector inside the monitor is labeled GND, VT, H, DU, and VI. I took a guess that H was H-sync, VI = video, DU = intensity, and VT = V-sync. That did not work out like I hoped. Then I switched the DU and VI wires, and got the same results. The screen goes black. I am testing this on the CRT out of an Amstrad PPC640 with the dip-switches set to monochrome. Does any of you know of a good way to test for which pin is supposed to go to which?

Thanks.

Reply 1 of 2, by retardware

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This is a MDA TTL monitor, not a composite monitor.
So it has 18.4kHz and .7V composite signal = always black.

Just test/use it with a MDA/HGC, not with a "home computer". 😉
You might mod it of course for composite input, but it is imho not worth the (substantial) effort.

Reply 2 of 2, by Rhoffman

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I know the monitor is MDA TTL. The Amstrad I'm using has a 9-pin cga/mda port. That's what I am testing with. I'm trying to differentiate the signals in the monitor, they are labeled different from the pinout diagram for mda and someone cut the original wire. From what I found so far the h-sync uses the 18khz signal. If hooked up properly should it show scan lines or something? I'm trying to figure it out without having to do the switcheroo method until it works.

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