Yeah, change the title to FREE PORN! or CAT PICTURES! 
But seriously maybe change the title or start a new thread about these things to catch people in the knows attention, could end up with a lot of useful info on how they work.
Shameful really that I haven’t learned about this stuff yet but I know the rabbithole will be deep and never ending once I start so have been avoiding firmware & drivers so far.
I removed the FET and measured the board. There’s continuity between all pairs of pads….
which is not surprising after the fact.
Orange an blue have a direct connection with a 47k resistor.
Blue and violet have a connection with a 51 ohm resistor.
Orange and violet have a connection through blue.
I think that the FET is broken. But I’ll try to reinstall it, maybe there was some soldering issue.
I googled it and there are good descriptors of how to test the FET, lost me pretty quick but that’s easy to do these days…
Indeed. 
I set out to do it, took the FET and started measuring. Test 1 - probably failed. Not sure, the tiny MOSFET would move under the slightest touch. I turned to find something to hold it. When I turned back…the MOSFET was gone. Did my t-shirt touch it during the turn and swipe it off the table? I don’t know. Anyway - I failed to find it. I think I’ll need to ask somewhere else to find a replacement….
Digikey has them, it’s an SOT-23 MOSFET. They’re pretty cheap, from what I saw perusing the list looking for what to expect power wise.
Lay a flashlight on the floor and use the beam to make that little black box stand out. I’ve dropped smaller stuff and found it this way…
THIS Infineon model looks good, I didn’t look at all the options but among the dozens I searched this one looked like one I’d order… at about .48 US (half a dollar)
Thanks Dale
I tried finding it, it’s gone for good.
I decided to bridge the pads and add a qtc pill though.