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The portion of the soft power circuit that interacts with the machine's OS is circled in green in the image below. Essentially, when the machine is on, pin 1 on UB13 (the reset pin on the flip flop) is pulled high via R112. When you select "shut down" in the Finder, Mac OS does its cleanup work...

I actually didn't notice the bio previously; I've enjoyed some of your YouTube videos. Of course you knew that stuff stuff already....

To my knowledge they are custom model-specific ASICs, so your only source is another LC II (or perhaps LC III or CC?) motherboard. No sound after recapping seems like a common problem on LC IIs (not sure if this is your situation). In my case, repairing the connection to the sound chip's +8V...

I am curious about the cool-looking ADB keyboard shown in the photos. Is that something you hacked together yourself, or was that sold at some point?