Small 101 KB PDF classified as a schematic, named only 9402gyt, which gives no clear device, brand or board number. At that size it is more likely a single-chip reference circuit or a short datasheet excerpt than a full laptop schematic, so open it to identify the part or product before relying on it. Schematic PDFs of this kind help a technician check pinouts, expected voltages and the surrounding passive components when testing or replacing a suspect IC on a board.
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 @one5technology. 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.