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Thursday 31 May 2018 at 09:21
Quoted from newtoit:I replaced U20 on the mpu board and it did not fix the issue. I was looking into some other people's threads and one person happened to mention U1 on the 10 opto board, I looked at it and one of the pins looked burnt so I replaced that and it fixed the issue of two rows shorted t...
Source: http://pinside.com/pinball/forum/topic/wpc-switch-matrix-issue-row-shorted-to-ground#post-4427050