Schematic for MSI mainboard MS-16J91, supplied as a PDF inside a 1.46 MB RAR archive. The name gives no revision, so compare the version on the PCB silkscreen with the one in the drawing title block. MS-numbers follow MSI's own numbering, which identifies the board directly rather than the retail model. A schematic lets you follow power rails, check signal paths, look up component values and understand power-on sequencing during diagnosis. Open it with any PDF viewer, ideally alongside the MS-16J91 boardview for part locations.
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.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.