Broken connector power on/off on the mot...

I can't say i can give you the schematic diagram of the logic board but i can tell you that since the board isn't one solid board like PC's and instead is multiple boards connected by flat ribbon cables you might be able to just replace that section of the iBook. So with that said, if you go to ifixit.com you can find most of Apple's portables solutions and parts there. They can also provide you with the exact step by step instructions on how to replace or install new/refurbished parts.