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Old 12 July 2018, 16:52   #1
Vulpine
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Vertical bars from CompServ scan doubler

Hi everyone!

I've recently added a CompServ v1.1 scan doubler to my A4000 desktop. It works and I can see AGA modes on a VGA monitor, and through a Cybervision 64, but with one problem.

Solid blocks of colour have repeated vertical bars running through them. These are static and consistent, and appear when viewing either through the Cybervision or through just the scan doubler.

A 15Hz monitor attached to the RGB output shows no problems, so this is likely an issue with the scan doubler or the video port itself. Would anybody have any suggestions on where to look to diagnose and hopefully resolve whatever causes this?
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Old 12 July 2018, 21:00   #2
Jope
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Check behind the zorro riser for bent/shorted pins first.
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Old 14 July 2018, 20:13   #3
Vulpine
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Hi Jope,
Whereabouts should I look exactly? On the A4000 motherboard or on the riser itself? I can't see anything obviously wrong at the moment visually.
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Old 14 July 2018, 23:39   #4
stachu100
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Check on CRT VGA monitor. Not LCD.
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Old 15 July 2018, 10:39   #5
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I reread your question and came to the same conclusion as Stachu.. Probably scaling side effects.

The short circuits I referred to are on the solder side of the riser, around the area where the hard drives are.
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Old 16 July 2018, 22:32   #6
Vulpine
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Thanks for the suggestions. I'll see if I can hunt down a CRT monitor to test with!
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Old 16 July 2018, 23:15   #7
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Also good to try is to play with the pixel clock/phase settings of your LCD, maybe you can tune the picture to acceptable results.
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Old 17 July 2018, 01:52   #8
utri007
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Quote:
Originally Posted by amigoun View Post
Also good to try is to play with the pixel clock/phase settings of your LCD, maybe you can tune the picture to acceptable results.
This how I fixed vertical bars problem with Micronik scandy and DCE scanmagic
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Old 17 July 2018, 02:18   #9
idrougge
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Was it only I who interpreted "VGA monitor" as "CRT"?
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Old 17 July 2018, 02:26   #10
stachu100
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Was it only I who interpreted "VGA monitor" as "CRT"?
Lack of pictures from your side.........
1 picture is better than 1000 words.
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