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Old 28 April 2008, 23:06   #1
snowman040
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Repairing CV64/3D Scandoubler ?

Hi, I have CV64/3D with dead ScanDoubler. Card works fine, but SD seems like it's 'not ScanDoubling', there is some output (seen on very old vga monitor) but newer (Samsung 957) says 'sync out of range'

Any idea where to start looking ?

Thnx...
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Old 28 April 2008, 23:14   #2
Boot_WB
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Does the "sync out of range" message also state what the horizontal/vertical sync rates are?

It could just be that the Samsung monitor is not capable of displaying the scandoubled output.

Regards



Rich
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Old 28 April 2008, 23:27   #3
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No, just "sync out of range".

I doubt, because CV64's output is displayed with no problems.

This old monitor I'm using has no "sync out of range" protection, so if you put 100hz output - screen gets garbled, but you can still 'see' the picture (jumping like crazy).

I think SD is just passing-by signal from video port on A4K
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Old 28 April 2008, 23:30   #4
Boot_WB
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What screenmode are you using on the A4K?

If you are using dblpal, dblntsc or Euro72 this will just be passed through without scandoubling.

You could try a standard pal screenmode - see if that works.

Just pointing out the obvious, hoping that your scandoubler isn't broken.

Regards



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Old 29 April 2008, 00:39   #5
snowman040
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I did try all that actually I tried running SD without any boot - just insert disk animation, or boot menu - the same thing
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Old 29 April 2008, 00:49   #6
Boot_WB
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Firstly, I'd try cleaning the goldfinger contacts on the scandoubler - it may just be a bad connection with the video port. I'd recommend using a pencil erasor and gently rub the contacts - you'll see them turn nice and bright. Then wipe away any rubber fragments with a clean cloth/tissue/cotton bud.

Also, if you have a multimeter capable of measuring frequency, you could measure the frequencies on pins 13 and 14 - if the output is NOT scandoubled, you should read around 15.5kHz on pin 13, 25Hz on pin 14. If it is scandoubled, you'll read around 31kHz on pin 13, 50Hz on pin 14 (Assuming you are using PAL, not NTSC).



Hope this helps.


Rich

Last edited by Boot_WB; 30 April 2008 at 00:27.
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Old 30 April 2008, 00:26   #7
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Great idea! I'll try this soon as I find good multimeter. Keep you posted, thanks...

p.s. Pins 13 and 14 with pin 10?
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