The failsafe circuit to protect against this (over voltage condition) is maybe $3 and incredibly routine in anything with power. I would bet everything that it is in there.

What's most likely though is that the fuse is also internal, and externally the unit will appear bricked.

While in general most parts will work beyond their ratings to at least some degree, this isn't really a safety margin. A safety margin is known, rated, and validated, and usually a property of a system as opposed to just one part within it.

That’s what I said?

Usually a system would have a safety margin of at least 1.5x, or 3x or the like.

In this case the design safety margin appears to be…. 1x? Exactly?

Suspiciously so. I'd love to see somebody(or somebodies) with an established reputation reverse the controller software & hardware.

Your safety margin is my profit margin.

- Mr MBA