Schematic diagram in PDF form for the ASUS X407UBR motherboard, revision 1.0. The roughly 9 MB document covers the board circuitry and is used to trace power rails, check enable and power-good signals, find component values and understand the boot sequence while diagnosing a dead or unstable board. Open it in any PDF reader and search for net names. Make sure the revision printed on the PCB is 1.0, since later revisions of the X407 series may differ in parts and layout.
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.