RAR archive of 653 KB containing a boardview for LCFC board NM-B741 with project code EYG70, listed under Lenovo. The file name does not state the laptop model or a revision, so identify the board by the NM-B741 marking printed on the PCB before use. NM numbers belong to the LCFC numbering scheme used for Lenovo machines. A boardview viewer such as OpenBoardView or FlexBV shows the component placement and net connectivity, useful for tracing signals, probing test points and pinning down shorted parts.
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.