Okay, I'm still probing what I think is the 5V and 12V lines on the V10 to try to find an open component that sits on BOTH lines. I may have found one...it's tiny (of course). One side is on the 12V rail and the other is on the 5V rail in some way or another.
I removed the component from the board and used my Huntron on it...the results...were...odd. Assuming this is it...which I don't think is right:
https://www.diodes.com/assets/Datasheets/ds30330.pdf
There is no connection between pins 1 & 2, there is a diode connection between (I think, hard to know if i'm backwards from memory) 2 & 3, there is no connection between 1 & 3. The fact that half the path is dead, could indicate this is what I shorted out during my 1V injection test. It could ALSO have been the component that failed short originally to have the 5V line bring down the 12V through enabling something else...that's purely a wishful guess though.
The the marking layout is correct, but the values don't make any sense.
If you look at the picture I took, it clearly looks to me like it's say N ZERO S (N0S). It could be a 5, but it's too rounded to be a five to me, perfect for an "S" though.
No marking SMD code book I've tried has a N0 with a letter like that...nor an N "O" with any following letter.
I could also be reading it backwards? Because every letter can be reversed and still be correct, it could say "s0N", which "s0" is known SOT23 part and a diode..though no one claims to have an "N" at the end of an "s0" or "so". So still a problem.
So I'm stumped, if I can get a replacement part that I know is real, I can check it against this part, install it and see if anything changes.
I know a few of you members deal in this stuff/profession. Please take a few minutes to help me out on this. Even if there is a slim chance I can repair or get further along on this V10 card, it benefits us all, I'll share what I find on this effort.
NEED -> 