A 90.8 KB PDF titled only with the part number 2N5550, so no board, laptop model or revision can be matched. The JEDEC 2N prefix marks a discrete semiconductor, so the document, though filed as a schematic, is most probably a datasheet. Use it to identify leads, read voltage and current limits, and judge whether a substitute is acceptable. Other editions of this part appear in the index, so compare them if figures look inconsistent, and always check the marking on the component itself.
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.