Indexed as a schematic, the 51.2 KB file 30SCLJQ045 appears to be a single component datasheet for a rectifier, sitting between the 030 and 060 voltage grades in this series. Nothing in the name points to a specific laptop or board. In practice such a sheet is opened in a PDF reader to verify the package drawing, terminal assignment and maximum ratings before a component swap. Check the full code printed on the part, and pay attention to anode and cathode positions shown in the outline when installing a replacement.
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.