Schematic for Lenovo board NM-D961, provided as a PDF inside a 1.51 MB RAR archive. The NM-xxxx pattern is used by LCFC, the Lenovo-owned design and manufacturing company behind many IdeaPad and ThinkPad boards. The drawing set lets a technician follow power rails from the charger through the system supplies, read the power-on sequence and identify part values around a fault. No revision is given, so compare the revision printed next to the board number on the PCB before replacing components according to the sheets.
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 @cyberlanelectonik. 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.