PDF schematic for the X453MA laptop mainboard, a model name used by ASUS. The name carries an RG suffix whose meaning is not stated, and no board revision is given. Open it in any PDF viewer and use the search function to find nets, connectors or component references. It is useful for following the standby and main power rails, checking charger and regulator circuits, and locating signals to measure during no-power or no-display diagnosis. Confirm that the revision on your PCB matches the title block of the drawing before working from 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 @alischematics. 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.