LCFC boardview for board NM-F331 at revision 1.0, archived as a 2.06 MB RAR. The name does not mention a laptop model, only the LCFC board code, which belongs to the numbering scheme Lenovo's own ODM uses. Technicians load the file in OpenBoardView, FlexBV or a similar viewer to see part positions on both sides, search nets, trace power rails and locate test points while diagnosing a no-power or short-circuit fault. Make sure the NM-F331 marking and revision on the PCB match before relying on it.
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 @BoardSchematic. 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.