Or if one adds 12vdc fans to the exhaust of the box, powering with 12v out of the 4 pin molex, even unplugging everything then reassembling, plugging in the external 12vdc fans FIRST would kill any high voltage on that 12 volt rail. This might not be much help if the power supply has multiple 12 volt rails in which case you'd have to make sure each rail had a fan on before getting attached to the miner.
or just pick up a $3 PSU tester with a screen instead of jumping the pins and let it drain the rails
Yes, but lets get this exploding capacitor problem ended so they can start shipping again. Does the board have MOVs on the 12v rail? Not sure how effective at protecting tantalum given the tantalum sensitivity to high voltage and there's the power loss in the MOVs given that you'd want them conducting before the tantalum(s) fry and the closer the MOVs knee to the rail voltage the higher the leakage. Would that be significant overall? Probably not. They'd need add the MOV to the board. If it's multi-layver they can't just drill a pair of holes willy-nilly but careful placement of holes drilled, copper surface of rails exposed with scraping, MOV soldered to 12v and ground is a lot of work. Perhaps a connector, internal, with the MOV installed; unplug power ribbon, insert connector, plug power ribbon(s) into added connector might satisfy insurance people and protect the board. An exploded capacitor isn't a fire tho it may give off gas that smells like smoke.
And if you use any of my suggestions and your miner doesn't get an exploded cap, you can send tips to:
18XUsmKnuPmGdNaPrtpwSr11iAXFUdFUys
