Circuit diagram in PDF for the Lenovo NM-A091 motherboard, an LCFC-numbered board, as Lenovo's ODM uses the NM-xxxx pattern. The name states neither the notebook model nor a revision, so read the cover page to confirm the exact machine. Technicians use these sheets to follow the power-on sequence, check the charger and EC circuitry, look up component values, and find which net a shorted capacitor sits on. It opens in any PDF viewer. Pair it with a matching boardview for part locations, and verify the board revision first.
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.