The nice thing about the Nanos is that they are are very small. The less nice thing about them is that many of their parts are integrated into the logic board.
-
Having that said, try replacing the click wheel. If this doesn't solve your problem, all signs point to the logic board.
+
Having that said, try [guide|435|replacing] the [http://www.ifixit.com/iPod-Parts/iPod-Nano-1st-Gen#0-Click+Wheels|click wheel]. If this doesn't solve your problem, all signs point to the logic board.
The nice thing about the Nanos is that they are are very small. The less nice thing about them is that many of their parts are integrated into the logic board.
Having that said, try replacing the click wheel. If this doesn't solve your problem, all signs point to the logic board.