Narrowing down the failure mode of an ICM control board for absolutely no reason other than practice. I forgot to mention this, but I've held on to this board for a long time, and I've desoldered some parts I've needed for other projects, which is why it is missing resistors in certain places. Correction with diodes. they generally turn on when forward biased with a voltage in excess of .7V(I said 7V in the video oops)