Did you find a resolution? I'm experiencing the exact same thing with a brand new PCB after doing an LED swap (powered on)

Appreciate it, they're cheap enough to just order new ones and try out (hopefully this works on my BSD too) but maybe I can try and diagnose it first.

I'm pretty new to the hobby and finally have a place to start going through the machines I've been collecting for 2 years, T2 is a mess.

Replaced U20 and it un-bricked my switch matrix, but now none of the switches in column 3 will register. I replaced all the connectors to make sure I had good contacts

t2_switch_matrix (resized).png

Also, targets 1-4 in column 7 simultaneously activate the corresponding switches in column 1 but not vice-versa, but that was an issue before I shorted the new cpu board

I did purchase the logic probe but unsure of how to power/use it, can I simply remove all connections from the CPU save from the power driver board, turn on the machine and attach as shown in your link?

Alright, will do, thanks for pointing me in the right direction.

Positions 11 & 16 on the output, 3 & 8 on the input did not pulse.
J206/207 position 3, no pulse.

Pulled the board off to inspect and found this:
78326F14-013E-49D1-9C4E-877F915122F0 (resized).jpeg

Looks like a possible errant bridge between Resistors 70 & 71, kind of hard to tell, but the resistance on both checks out. Continuity from J206/207 to U20 then from U20 to U14 also checks out which leads me to believe that maybe I fried U14 too, so I checked it with my DMM and it looks like position 5 has a short, which correlates with no pulse positions on U20 and J206/207. So I’ll get to replacing it as well and cross my fingers

Aftermarket, this one:
https://www.marcospecialties.com/pinball-parts/A-12742-XXXXX