Helifire has an invisible submarine (lost its color)

wantdataeast

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I've got two Nintendo Helifire board sets which I'm working on, one is working perfectly, the second is giving me an odd minor color issue on a submarine.

The troublesome board set has a submarine which has lost its purple color, and appears like it's in stealth mode. The normal coloring of the sub is a combo of bit of a background color, let's call it a shadow. In front of that shadow is a pink sub shape. The pink color is lost so I'm just looking at the shadow at this point giving it the appearance of an invisible/stealth sub.

I am guessing the pink shadow is stored on some rom chip in here, but I have swapped every rom chip with the other boards ROMs and the invisible problem does go not with the ROM chips to the other board. So maybe there's a chip in here is not causing the purple to be visible?

This is what a purple sub looks like:

This is what my invisible sub looks like:
 
So if I look at the water area here on my correct good board set, the color graduates and changes as it moves toward the bottom of the screen. Again this is my good board set with no problems

1757869562668.jpeg
 
This image is from the board set with the invisible sub. No graduated color.


1757869719237.jpeg

Here is another vid:
 
I've made the determination that my isssue is on the ESS board. I've swapped my ESS boards with (from the invisible sub, wonky colored board set) to my good board set and the color issue traveled with it. I have checked the color prom and the resistor pack, both are good. Any ideas?
 
Last edited:
Solved: After recapping the whole ESS board there was no change, I simply adjusted the red potentiometer as seen in the following pic, and I started to see the gradient pattern appear in the water, adjusted it more and the gradient looked perfect, and the sub became pink/purple again. Solving the invisible sub problem and gradient issue. So a simple fix after all.

1757947612378.jpeg
 
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