Schematic document named simply A6G, a 1 MB PDF without a brand or mainboard number stated in the name. The title block and revision field on the opening page should identify the product, and that information must match the board on your bench before the diagram is trusted. Repair technicians use schematics of this kind to trace power sequencing, find the regulators and switching MOSFETs for each rail, and locate the components responsible for a short or missing voltage. Any PDF reader opens it, and text search speeds up net lookup.
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 @hrtechno. 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.