There is also a very comprehensive post on here about unbricking your drone. There aren't schematics but instead pictures in hi-res of the boards from the bird / Gimbal and RC.
What is it you want to do ?.
If your looking at trying to get into the file system that is possible / re-writing firmware yep that too.
Just requires some delicate soldering and following the well composed guide.
at the moment I have only to change some ESC mosfet, for this operation I don't need schematics.
I ask for schematic only for having it available if necessary in the future... and for study it out of curiosity