Circuit schematic for Quanta project R18D, a 2.83 MB PDF with no brand, model, board number or revision in the name. Identify your board by the R18D code on the PCB silkscreen before working from it. Technicians open such PDFs to search net names, follow voltage rails and power sequencing, check component values and work out which circuit is pulling a rail to ground. Quanta is an ODM producing laptops for multiple brands, and different revisions of one project may change parts, so confirm the revision as well.
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 @pepeelectronica. 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.