Although filed as a schematic, this 37.9 KB PDF is named after 2SD2460 with an extra E tag the name does not explain. Under the Japanese JIS numbering scheme, a 2SD prefix denotes an NPN bipolar transistor, so this is most likely a component sheet, not a board diagram. No laptop or motherboard is mentioned. Use it to read pin order, voltage, current and gain ratings, and to judge substitutes. Check the marking on the actual transistor, which is often abbreviated without the 2S prefix.
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.