Konami Double Dribble background bars

Darksoft

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Konami Double Dribble error showing bars

Hello Everyone,

This is my first post and I'm trying to repair my first Jamma Board.

It's an original konami Double Dribble Board. The problem is that the background shows some white bars. I checked the 74Ls and they all look ok. Also no signs of broken or damaged tracks. Neither any chip gets too hot.

I changed dip sw. 3 to enter test mode and everything was ok except for the color test.
The right part of both vram color and obj color are showing the same bars.

Bars start with color green and go to the right to the blue. Color Green seems to have black bars in the middle and the other 3 colors (pink, red and blue) have white bars in the middle.

Any idea about what else could I check? I hope it's not any of the two custom 005885.

By the way, I managed to recreate more or less the error with mame, filling the first c00 bytes of 690a09.bin with 0's.

Any help is appretiated.
 
Last edited:
pictures

I added some pictures so maybe someone can help.

As you can see in the picture of the stands full of people, on the blue fences, one can also see also the black bars, but the crowd is ok.

The same happens during gameplay, as you can see sprites are ok, but background not.

Any tip is appretiated.

Thanks in advance.
 

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