Lenovo laptop boardview for board NM-C991 with project code GY552, delivered as a 3.70 MB RAR. The NM- prefix follows the LCFC numbering used for many Lenovo IdeaPad and ThinkPad mainboards, and the name gives no model or revision. Open the contents in a boardview program to search parts by designator, highlight nets and find test pads when tracing power rails or a short to ground. Before relying on it, compare the NM-C991 label and revision on the PCB, since LCFC may reuse a project code across 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 @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.