Schematic for Wistron IO board 18B25, revision A00, a daughterboard that normally carries ports and connectors linked to the motherboard. The laptop model is not named, although the number sits close to the 18B26 sensor board and probably belongs to the same project family. Use the PDF to check connector pinouts, port power switches, ESD parts and the signal paths back to the main board. Before relying on it, confirm that the code silkscreened on your IO board matches this drawing.
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 @vinafix_bios. 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.