BOP - switch matrix woes

bpick

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I am stumped, I can do board repair, etc... when I know what I am needing to replace but the time has come where I cannot figure something out.

My Bride Of Pinbot column 4 is acting like column 3 all the way across, when I test the MPU at the switch plugs with the playfield disconnected I get the same thing.

When I test the rows when I get to column 4 for that row is act's like column 3 so I guess what I am saying is either way I test it row vs. column column 4 will always act like column 3.

Now I don't know how to test the UNL2803A chip but from what I am reading is that the likely candidate?

Thanks
Brad
 
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