Dart board has a math problem...

Mongo

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I have a Arachnid Super 6 dart board that scores incorrectly. Some segments do not score at all and others have absolutely incorrect readings (50 scores as 54, 14 scores as 48, ect.). I have swapped around enough parts from other boards to tell me this is isolated to the main PCB. All of the chips are socketed so repair should be a breeze. I just need to know what would cause this scoring problem...

Again, the matrix and input board are fine. The problem is on the main PCB...
 
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