Schematic-category PDF of 87.1 KB whose name gives only 21DQ06, without any laptop model, board number or revision. The code follows the style of a discrete part number, so the file is probably about a component and not a complete motherboard. Open it with an ordinary PDF reader to see what it contains. Such a reference helps when you test a part with a multimeter in diode mode or pick a replacement with equal ratings. Match the full marking on the component, since a related code can differ in voltage or current.
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.