HI Oldturkey,
I know this is an old thread but hopefully you are still active.
I have an iPod classic which will not charge the battery or sync.
I have tried 3 known good batteries etc and have also checked the fuse and also replaced the Power IC.
I have checked the battery connector and it seems solid, it is also receiving voltage to the battery connector.
Before I go about replacing the notorious docking port, are there any other Mosfets or Diodes I could check that you can think of? There doesn't seem to be any corrosion on the board and it the ipod itself is in pristine condition
Thanks