Schematic PDF for the X55C, with an RG suffix whose meaning the name does not explain, and no revision or brand stated. X55C is an ASUS laptop model, so this circuit diagram should cover its mainboard. A technician uses it to trace power rails, check charging and sequencing circuitry and identify components when a board has a short or no power. It opens in any PDF reader. Check the board revision printed on the PCB against the title block of the schematic 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 .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.