This 67.6 KB PDF, sorted under schematics, identifies itself only as 1SS300, with no laptop or board stated. In the JIS numbering, 1SS covers small-signal diodes, a series Toshiba uses extensively, so the document is most likely a single-part datasheet. Consult it for the pin assignment, internal configuration, forward and reverse characteristics and package drawing. That makes it easier to identify a marked SMD diode and pick a replacement with matching footprint and ratings, after confirming the marking on the PCB.
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.