Schematic diagram in PDF form for the ASUS X441UBR notebook, revision R2.1 of the mainboard design. Circuit pages like these document power sequencing, voltage regulators, rail names, connector pinouts and signal paths, so a technician can work out why a rail is missing or which part feeds a given line. Any PDF reader opens it, and pairing it with a boardview of the same revision makes component location much faster. Confirm that the revision silkscreened on your PCB is 2.1, since other revisions can differ in parts and 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 @boardviews_schematics. 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.