Code 20CJQ100 names this 201 KB PDF, which is catalogued as a schematic but identifies no brand, model, board number or revision. The code reads like a discrete part designation, so expect component-level data rather than a full motherboard circuit. Any PDF viewer opens it. Use it to confirm pinout, package and limiting values when diagnosing a failed part or sourcing an equivalent. Compare every character with the marking on the original device, since related codes may differ in rating.
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.