TECH: Space Duel (display bad)

jetusenet

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Donor 4 years: 2011, 2013-2014, 2024
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Hi;
I am troubleshooting my Space Duel and have an issue with the display.
The game plays blind 100%, coin up, sounds, controls etc but the
display is limited to the upper left quadrant of the CRT and instead
of the normal items that should be displayed, I have what looks like
an oscilloscope output:

This pic is in attract mode:
http://forums.arcade-museum.com/attachment.php?attachmentid=14494&stc=1&d=1251969048

This pic is during play:
http://forums.arcade-museum.com/attachment.php?attachmentid=14495&stc=1&d=1251969048

This pic is in test mode:
http://forums.arcade-museum.com/attachment.php?attachmentid=14496&stc=1&d=1251969048

I swapped a working boardset and the game plays perfect so the problem
is with the PCB.

Any hints on how to proceed - what to look for??

Thank you
Jeff
 

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  • Play.jpg
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  • Test.jpg
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If you have a working boardset, try swapping the AVG chip from the good board to the bad board to see if that fixes it...
 
If you have a working boardset, try swapping the AVG chip from the good board to the bad board to see if that fixes it...

OK, finally got a chance to get back to the SD PCB.
I swapped the AVG with a known good and received the same display.
As I do not have a scope or a signature analysis set up, is there anything else I could look for? (except a repair shop). I do have a logic probe if that would help.
Thanks in advance.
Jeff
 
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