ASUS FX505DY schematic in PDF format, around 8 MB, with no board revision given in the file name. It covers the motherboard circuitry: power input and charging, CPU and GPU power stages, memory and interface signals. Repair work it supports includes tracing missing voltages, following enable and power-good signals during the boot sequence, and finding components on a shorted rail. It opens in any PDF reader. Because the revision is not stated, check the title block against the version marked on the actual PCB before measuring.
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 @cynetitsolution. 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.