Thanks for the excellent guide, I couldn’t have done it without you! This was definitely the most difficult repair I have attempted so far, mainly because everything is so small and tightly fitted into the case. The most time consuming part was actually fitting the logic board back into the case; the click wheel cable kept getting dragged into the case as I moved the logic board in. I had to keep bringing it out again to ensure it wasn’t going to get broken, and it did NOT slide in smoothly! You need a LOT of patience! But I got there in the end and now have a fully working 4th gen again! Rene’s tip above about using flux on the solder pads really does make the soldering part very easy if you are carful about it, so thanks for that. I would agree with the difficulty rating, this is not easy and certainly not for a novice repairer, but if you have the patience and go gently it can be done.