Schematic in PDF form labelled LA46 with a Dis suffix, which most likely marks a discrete-graphics variant, though the name gives no brand or full board number to confirm the exact laptop. At 1.59 MB it should contain the full circuit diagram set. Technicians use such a schematic to trace power rails, follow signal paths, check a short to ground and find the parts in a power sequence. Any PDF reader opens it. Before relying on it, match the board number and revision printed on the PCB against the title block inside the document.
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 @cyberlanelectonik. 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.