Can a
transformer fail with a bad smell with no outward sign of damage?
Absolutely. But,
are you sure the smell came from the transformer? Caps
are
notorious for being more unreliable.
That was my first suspicion too, but I couldn't see anything that had
obviously burned up and I still can't now. I didn't get the machine apart
again after the failure soon enough to locate the smell unfortunately.
Can this
transformer be replaced (see picture in blog)? - I suspect
not unless I find a donor PSU.
It is almost certainly a custom unit. It is
remotely possible some
similar power
supply might use a close-enough transformer.
Yes, I think my chances are low to get it replaced.
Regards
Rob