Quote: I think you are confusing the data pins with the power/SDM contacts. The power/SDM contacts are not touching any metal, and there is no physical way the contacts touch the same metal surface at the same time.
The data pins carry no current and are not part of the power/SDM circuity.
Unless communication between devices is done with magic smoke, the pins must certainly cary some current. Not sure how else this stuff would work. Somehow I question the magic smoke idea.
Still, I did comment that I see no way the SDM contact should short, I mean its surrounded in a plastic housing, so there was also certainly no confusion there.
Anyway, its all a computer, one way or another. There is also always the possibility of static charge being present to a degree that might over load any thing that was designed to handle super high voltages.
It is also possible that the OP played no part in the problem, and the damn thing just broke.
e.g My K7 is in repair for a handful of problems that likely could not be caused by any particular cause. (metering is way off - same scene meters from 2s, 1/250s through 1/3200s. The hot shoe is intermittently flaky, memory cards intermittently cannot be read. Lenses may not focus.)
The main CPU is likely just FUBAR.
Electronics have a certain failure rate, I probably just got stuck with a crap version.