PDF schematic whose name refers to Z470, a 989 socket or pin designation and PCH, the Intel Platform Controller Hub. No laptop brand, board number or revision is given, so open the document and read the title block to confirm what it covers. The file can serve as a reference for PCH power rails, straps, clock and reset signals while diagnosing a board that fails to start. Compare the drawing with the actual PCB markings before relying on its part references or values.
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 @alischematics. 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.