The 1SS398 is the subject of this 78.2 KB PDF, which is catalogued as a schematic but is likely a single-part datasheet. The 1SS prefix is the Japanese JIS-style code for small-signal diodes. The filename carries no laptop model, board number or brand. Use it to read maximum reverse voltage, forward current and package details when diagnosing a shorted or open diode, and to decode the marking printed on the component body. Check the polarity mark on the board before soldering 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.