Schematic PDF for the Lenovo GY552 board NM-C991, packed in a 2.21 MB RAR. The NM- numbering belongs to LCFC, the Lenovo ODM, and this set pairs naturally with the matching boardview for the same board. Schematic pages show power sequencing, rail names, voltage regulators and signal paths, which you need when diagnosing no-power or no-boot faults. Open it with any PDF reader after extraction. Make sure the board number and revision printed on the motherboard match before trusting the values shown.
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 @schematicslaptop. Enginerys does not host this file.
All sources (2)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @schematicslaptop | 1 Sept 2025 | Open file on RM Schematics |
| @schematics_bios | 26 Oct 2026 | Open file on RM Schematics |
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.