7i76E rev B versus 7i76E rev C

After searching for more than a year or two I finally got hold of a replacement 7176E, as on my old one one of the servo channels stopped working.

On the 7i76E I received I see that it is HW Rev B (my old one was Rev C).
After inserting the new card I noticed that the spindle control doesn't work.

Is there a difference between these two revisions that could explain why it doesn't work?

No, the only differences between 7I76E versions is that the overvoltage
protection is better on the C rev cards and the field power regulator uses
a different chip. The spindle interface is identical.

Ok thanks. Looks like the new one is also defective then

For simple isolated issues (like a step/dir channel failure or spindle issue)
It is possible to repair the card

Good to know - I am in the EU though, not sure that is feasible here.

If you have one working card you could choose the slowest/cheapest shipping option for
the other card Also both issues (damaged step/dir output or damaged spindle output)
are relatively easy  to repair if you have a nearby person with SMT repair ability
(the affected parts are known and inexpensive)
 

I found someone to help me with that (YouTube channel talla83), thanks a lot!