I got around to attaching my dead board to a battery yesterday using the cables which led to the
power supply. I pulled the board and walked it to my car.
 I had another person with me, neither of us heard audible pops
and we didn't see anything is bubbled/charred.

The first time I hooked it to the battery all the LED's lit up, then went off and all but one relit. I think it was D38.
All the others, including D45, lit up and stayed solidly lit.
I left it attached for like 10 seconds, we neither heard nor saw anything.
Did it again, same deal.
Did it again, seems like something had changed, the point where I attached the pos cable to the battery started to sizzle.
I disconnected, thought I'd just not pressed hard enough.
Repeat, pos connection started to sizzle.