Williams display flickering

dandydan1959

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Hi,
I am working on a Williams Grand Lizard and have a display question. When I put the game in test the displays work fine. When the game is in attract mode or game mode random digits flicker or portions of the digits are not illuminating.

Test mode good all digits. Can someone tell me the difference between test and game mode?
Thanks
Dan
 
Attract mode and test mode generally are displaying the same digits on every display, with few exceptions. During play you're showing different digits all over the place.

I'd try checking the connectors on 1J5 first, as that's your BCD lines that define the digits.

-Hans
 
Good advise

Hi,
I cleaned the plug on the CPU that connects to the display driver board. It had corrosion from the battery pack leaking. Replaced the battery pack and cleaned up the corrosion and everything is working fine.
Thanks for pointing me in the right direction.
Dan
 
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