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Kids, changing the polarity of components that don't seem to work in an attempt to get them to work often makes them work even less.
RIP Recom R-78HB
A guy I used to work with told me if you haven't blown anything up then you haven't learned anything.
Yep, have to learn it the hard way, lol π... everyone learns it the hard way π.
I was a bit surprised because this unit has got protection against just about anything. I didn't expect reverse polarity to do it in. π
You could actually try to see if has a zener or a schotky diode inside the unit and just remove it, it's probably short circuited. It's there for protection, so the whole thing doesn't go poof if a PSU with inadequate voltage or reverse polarity is plugged in. If it's a schotky diode, it's probably in series with the +. If it's a zener diode, it's in parallel with the rails, between the + and -. In the first case, you need to remove and short circuit the diode. In the second case, just remove the zener diode.
Plug it in, see if goes KABOOM π€· π.
Thanks for the suggestions but it's all potted. βΊοΈ
Lol so sorry for your loss