What RJ said. I too have never heard of reverse polarity blowing anything other than me (or some other human) and I've had a rig with reversed wiring so .. Well, it would like to knock me on my keister but that's the only damage.. I fixed it proto (There was an extension cord and adapter. SO long as I used the cord and adapter the original owner made,, no problem but if I used my own (Commerically made) cord I got shocked, Turns out he'd hooked the white wire to the dark screw and the black wire to the bright screw, on both the adapter and the cord plug (He made the adapter from a standard extension cord by simply cutting the plug off and attacking the twist lock outlet to the resulting pigtail, then he cut put a new plug on the cord,, I had to fix both).
I have heard of repair people saying things that are provably false in order to make it look like the bad hardware is YOUR fault. When in fact it was a warranty issue... That I have heard of many times. IF they think you do not know about this stuff they blow more smoke than your converter did when it blew.
Now: There is one part in poorly designed converter that MIGHT blow if you plugged into reverse polarity.. but note the POORLY DESIGNED.. Can't happen if it is well built.
Oh, and you would likely never knew it blew. since it's a RFI suppression device. Not critical to the operation of the unit.
