The 208 KB PDF named 20CTQ150 is listed as a schematic, yet the name reads like a discrete component part number, not a motherboard identifier. It states no laptop model, board number or revision. Part codes of this form are typical of International Rectifier rectifier diodes, so expect datasheet content: electrical limits, thermal data and the case drawing. This helps when identifying an unmarked or burnt part in a power supply stage, but verify the marking on the real component first and match package and pinout.
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.