Schematic in PDF form for a motherboard identified as GM5PG3E, revision V1.1, about 4.7 MB in size. The name gives no laptop brand or model, so identify the target by the board code printed on the PCB and check that the revision agrees. A circuit diagram like this lets a technician trace power rails from the charger input through the voltage regulators, follow enable and power-good signals, and read component values when replacing failed parts. Any PDF reader opens it, and text search helps find net names and reference designators quickly.
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 @cynetitsolution. 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.