ASUS ZenBook Q420VA archive of 13.9 MB, with no board revision or contents listed in the name. It may contain schematics, boardview or BIOS files, so extract it and check before use. Such material lets a technician follow power rails, locate components and test points and diagnose no-power or no-display faults. Boardview files open in OpenBoardView or FlexBV, schematics in a PDF reader. Confirm that the motherboard revision printed on the PCB matches the documents before relying on part positions.
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 @azvoltagemap. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.