Lenovo diagrams are not reverse engineered, those are original manufacturer documentation, with notes, diagnostic info etc.
Open Source Hardware Explained - EEVblog #195 https://www.youtube.com/watch?v=I0HOgcbtmws
EEVblog #333 - Unwritten Rules of Open Source Hardware https://www.youtube.com/watch?v=NOUaoLjrNPo
and finally EEVblog #921 - Open Source Hardware Problems Solved! (except he doesnt solve anything) https://www.youtube.com/watch?v=5wrSXCBdalc