click wheel.

i have replaced my logic board in my ipod nano 1st generation. i have two of them and i have all ways preferred my black to the white. the black nano died. logic board had fried to i took the white logic board and put it in to the black. used the screen from the white one. but the click wheel isn't working and it worked before it died. is the anyone who cam make a suggestion on how to fix this with out replacing the click wheel.

*logic board are different between the two nanos. i don't know if that make any difference.