Hi all...I was wondering if I could get some technical help with a ground short problem?

Was changing out some playfield bulbs on my Party Zone, turned the system on and began to play. After shooting the ball up the rocket ramp it took about 7/8 seconds before it registered and shot out with the kicker. Even the captain's head in the middle didn't turn back to look until that point it was getting kicked out.

I went into switch edges to see if there were any problems, and found out the back ramp switch "31" where the ball comes up the Rocket ramp was giving a ground short error. I also checked other switches and found out that the "eat drink and be merry" targets are also throwing ground short errors.

Looked at the switch Matrix and found out that they are all in the same column "column 3". What I'm getting confused about is it's telling me a row is bad. Everything in the rows to the left and right of column three are working fine. I unplugged both row and column connectors from the board and don't have any error showing up in the switch edges test. Only the "always closed" shows up.

I disconnected the back ramp switch completely and and still getting the error. I then removed the green/orange wire that is used in column 3 from the eat drink targets and touched each one individually with the wire to isolate each of the 5 targets and I'm still getting the row error on all.

I may be mistaken in my understanding of a switch Matrix, but I thought the main power going into a switch comes from the column and is spread out amongst the rows. When I disconnected the column harness from the board but left the row harness plugged in, I was still getting an error. Wasn't quite sure how I can still get that power to the target unless there is still power coming from the row and obviously the target is grounded. If someone can please correct me where I'm wrong in thinking of power coming into the switch Matrix I would appreciate it.

I checked everywhere for pinched wires and couldn't find anything pinched, also checked for anything touching the ground or the diode and found nothing. Any help would be greatly appreciated thank you.

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Got it sir...I was trying to work on it again and now I'm finding out that when I close the coin door, the switch gets activated and I'm getting a ground short error now.