Lenovo motherboard schematic for board NM-A091, supplied as a 4.13 MB PDF. The numbering follows the LCFC pattern used by Lenovo's own ODM. The name states no laptop model or board revision, so confirm the silkscreen on the PCB matches before relying on it. Technicians use diagrams like this to follow the power-on sequence, measure the voltage rails, find which component sits on a shorted line and check part values around the PWM controllers. Any PDF viewer with text search will open it and find net names.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @jdschematicsworld. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.