A small PDF of 196 KB filed as a schematic, named after the code 20ETF02, which looks like a discrete semiconductor part number rather than a laptop board. The name gives no device model, board number or revision. Codes of this shape follow the International Rectifier style for power diodes, so the document is most likely a component datasheet with ratings, a pinout and package drawings. Use it to confirm a replacement part, then check the marking on the actual component before ordering or soldering a substitute.
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.