Filed as a schematic, the 28.3 KB PDF 3LN02SP is named after what appears to be a discrete component code, here from the LN series with an SP suffix. The name states no laptop, brand or board revision. Such a small document usually covers one part: ratings, characteristic curves and package dimensions. On the bench it helps identify the part, locate its pins for resistance and diode-mode measurements and evaluate replacements. Compare the exact marking and suffix on the board component with this sheet first.
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.