Failed FETs just Use a nasty practice of having a whole lot extra circuitry down with them In case the enter of the supply isn’t appropriately confined or fused. They may be very straightforward to location then, though ^^ From wikipedia: RCDs are intended to work in 25-forty milliseconds, just https://power-supplies-refurbishm78887.articlesblogger.com/53205380/how-much-you-need-to-expect-you-ll-pay-for-a-good-power-supplies-refurbishment