PDF schematic for the Z470 laptop, with the file name pointing to the PCH section and the number 989, whose exact meaning the name does not explain. Expect the platform controller hub area to be covered: clocks, SATA, USB, audio links and the power sequencing signals around the chipset. A diagram like this helps when tracing a no-power or no-boot fault back to missing rails or reset lines. Open it in any PDF viewer and compare the board number printed on your PCB with the drawings before trusting component designators.
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 @schematicslaptop. 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.