Schematic for LCFC motherboard NM-C181, revision 1.0, shipped as a RAR holding the PDF and tied to the FA391 and FA491 project codes used on Lenovo laptops. LCFC is the Lenovo-owned ODM behind NM-prefixed boards. Extract with 7-Zip or WinRAR and open the PDF to follow power rails, the charger and EC circuits, and the CPU power sequence when a board is dead or shorted. Make sure NM-C181 and revision 1.0 appear on your PCB before trusting reference designators.
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 @ShareMan_Electronic_Files. 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.