Quoting Nigel Williams <nigel.d.williams at gmail.com>
As no one jumped in regarding my query, I thought I would venture out
along and try the tapping-along-the-seam technique previously
described and see if I could break into the dead Apple //c power
brick.
The tapping technique worked very nicely, although I had to apply
leverage with a screwdriver hammered into the seam to really crack the
two halves apart.
The scene of desolation inside revealed why it is dead-dead-dead, see
pictures here:
https://picasaweb.google.com/118247290269860741639/AppleCPowerSupplyBrickFa…
The smell is interesting too, it was nicely bottled up inside the
sealed PSU until I opened it...
looks like all 4 diodes are blown in half or burned in half from what i could see.