Laptop schematic labelled Z94RP, revision 1.2, supplied as a 2.50 MB PDF. The name gives no brand or board number beyond this project code, so confirm the details on the drawing's cover page. It is useful for following voltage regulators and power sequencing, locating test points and checking signals between chips when diagnosing a no-power or no-display fault. Any PDF viewer opens it. Make sure the PCB revision matches 1.2, since parts can change between revisions.
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.