I have a Black Knight 2000 with a controlled lamp issue. When one light is activated a few others activate as well, in game and also in test mode.
Im currently looking thru the schematics but would like help here as well.
I took a picture but the problem is not limited to the lights I pictured, there are a few more. The issue affects about half the controlled lights. The first half of the lamp matrix test is fine, one lamp lights. But the second half of the test, all those lights have 4 lights lit.
I have leds installed. Checked for bend diodes and made sure sockets weren't contacting anything.
I'll be looking into this but please feel free to interject with any information.

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Now noticing that columns 5-8 are affected. But what's odd is that the lamps being lit are in the same row.
For example, the picture I provided is..
Row 3 but only columns 5,6,7,8

Looks as though columns 5-8 go thru U52 (7408).

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While looking over the cpu I noticed that the resistor network at sr16 is cracked in the middle. I will replace it.

Solved! Replacing SR16 fixed the issue. Thanks