Schematic diagram in PDF for the ASUS X553MA laptop, with an RG suffix in the name whose meaning is not stated. The name gives no board revision, so compare the sheet titles and the revision block inside with the markings on your PCB. Technicians use these pages to trace the power sequence, charger and voltage regulator circuits, and signals between the chipset and the peripherals. It opens in any PDF reader and works best together with a boardview of the same board revision to locate parts physically.
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 @cynetitsolution. 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.