Schematic for the ASUS K56CM, provided as a PDF inside a 1.34 MB RAR archive; the RG token is not explained by the name and may be an internal variant tag. Laptop schematics document power rails, charger and PWM controller circuits, CPU and memory connections and the power-on sequence, which is what a technician follows when a board has no power or no display. Pair it with a boardview for component location, and compare the revision on the PCB against the drawing title block before trusting part values.
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.