I have the same problem🙁
You want to solder the 2 smaller ones, NOT the ones with the "Hook", looks like they hold the plug to the board.
I think with a really fine tip and solder as thin as foil should work.
Roll the foil into small strips and lay a wire down and hope for the best. Better yet just solder a little tiny amount to the wire then solder to the board, the pin closest to the modem and etc is the "WHITE power pin wire".
From searching the web it seems to be a really common thing for the ibook G4's to do.
Will let you know how mine goes in the next few days.