Click wheel not responding after logic board change

Hi all,

On my iPod classic 160 GB only the play/pause button did not work any more. The rest of the buttons worked fine. There was no longer a nice and snappy 'click' on the play/pause button.

I ordered a new logic board and installed that. All buttons now have a nice satisfying 'click' however, the iPod does not respond AT ALL to the click wheel, no buttons, no swipes, nothing (obviously the HOLD switch is off - no orange to be seen).

Curious is though, that the iPod 'comes alive' (the screen goes bright), then dims after about 8 seconds. About two minutes later, the screen becomes bright again, then 8 seconds later dims, etc.

If I connect the iPod to the computer, it says the battery is fully charged, and the iPod docks like normal to the PC, I can play music, see the file structure, etc.

I checked and double checked all cables and connections, they all seem fine to me and inserted and connected well.

What could be the problem? Is the new logic board compatible with the (old) click wheel?