Lenovo laptop schematic for the LCFC board NM-D191 revision 1.0, delivered as a PDF inside a 3.00 MB RAR archive. NM-xxxx numbers are used by LCFC, the Lenovo-owned ODM, and the board number is printed on the PCB. The name does not state the laptop model. The circuit diagram lets you trace power sequencing, charger and VRM rails, and signal paths when diagnosing no-power or no-display faults. Compare the revision on the board with revision 1.0, since part values and nets can change between revisions.
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 @schematiclaptopramkushwaha. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.