This iPod had been washed long ago, and the battery was dead
Unfortunately this iPod had been heavily used an abused by my son, such that the back of the case was a bit dented in a few spots (and the corners were a bit rounded in). The main problem seems to be that the back dents decreased the internal space to the point that the logic board couldn't slide out. I eventually put enough pressure on it to break other parts but the logic board never moved more then about 5mm.
If your iPod is too dented up, it may not be possible to slide the logic board out. It has to slide past the click wheel and it's components, and if you've lost just a little free space, it may not be possible.