Schematic PDF for the ASUS X553MA notebook, roughly 1.17 MB, tagged RG, which in ASUS naming usually refers to the release revision of the board; the number itself is not given. It contains the circuit diagrams for power delivery, charging, memory and peripheral interfaces, useful when a laptop shows no power or no display. Technicians use it to follow nets between pages, look up expected voltages and locate a shorted capacitor feeding a rail. Any PDF viewer works. Check the revision on the motherboard silk screen against the drawing before relying on it.
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 .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.