Schematic PDF for motherboard NM-C131, an LCFC board number; LCFC is the Lenovo-owned ODM that uses the NM- prefix. The name alone gives no model or revision, so check the title pages for the system and confirm the number on the PCB. Use it to trace power rails and the power-up sequence, the EC and charger stages, and signal paths, and to check component values when replacing parts. A matching boardview makes it much faster to find each part on the board.
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 @cidschematicandboardviewofficial. 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.