Hi all,
I'm having a boot issue with my Seawitch and I cant seem to figure it out. After the 3rd ring the MPU freezes up and makes a continuous screaching noise. After messing with it for a bit I am at a dead end to the issue. If I leave J2 on the lamp driver disconnected the game will boot completely and the displays light up correctly. From what I am seeing on the schematic is that J2 controls several of the feature lamps on the playfield. What I have tested/done so far:

Swapped all the boards in the backbox with known working ones
Repinned J2 on the lamp driver after seeing a bunch of "green goo" on the black/white wire connector
Tested several combinations of leaving different connectors unplugged on the MPU, Lamp Driver and Displays - at this point I am sure that it is the Lamp Driver J2 that is the issue

Can anyone point me where to go from here? Thanks in advance

After monkeying with the issue again this weekend I'm still no closer to a solution. In fact the problem is now worse. After lifting the playfield I now need to leave both J1 & J2 on the lamp board disconnected before I can get the game to fully boot.

A few things I tried before posting:
I disconnected both connectors to the back box lights and also the coin door and the problem persisted so I can rule out the back box lights and coindoor.
Measured for voltage on the ground strap and read as 0 so no issue there.
Looked over every inch of the playfield underside several times. No loose/broken wires and nothing touching were it shouldn't as far as I can tell.
Verified that all connectors are in the plugged into the correct position.

Before I start disassembling the wire harness to look for a short does anyone have any other suggestions on what to try or look for? Thanks in advance

I wanted to follow up on this and post in hopes of saving someone else alot of time and heartache down the line. After tearing every inch of the harness apart in an attempt to find a short I was no closer to a solution. It turned out that j3 pin25 on the SDB was not making proper contact due to the green goo from one of the wires deteriorating. REALLY wish I had looked at those connectors much closer before tearing everything apart.