i'm sorry... why does my laptop include a schematic sheet for smokeless powder?
what on earth does this even do? does it... crowbar the AC IN to ground??
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Where is the fuse on AC IN?
I've seen similar designs (in old oscilloscopes) that compare various voltages on the PSU output and if they seem to be out of whack wrt each other they latch up and disable switching PSU's oscillator.
