Laptop schematic labelled LGS-1 with the number 11246, a 2.68 MB PDF. The name does not state a brand or model, and 11246 looks like a Wistron-style board number, though that cannot be confirmed from the name alone, so compare the PCB markings and the cover page before use. A schematic of this kind shows power rails, the charger stage, CPU and memory regulators, the EC and BIOS flash and connector pinouts. It helps in tracing a missing voltage or isolating a short, and opens in any PDF viewer.
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 @afsschematicfree. 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.