@foone obvs I mean a hall sensor but also did Lenovo stop making repair manuals, the best documentation I can find is an iFixit guide where I can see nothing resembling a magnet. I'm guessing it goes into the screen bezel somewhere? they're not showing the back of that
@foone the obvious solution is to just stuff the thing full of magnets, just anywhere one might go
@noiob I can't find the reed switch!