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
this post was submitted on 06 Jun 2023
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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