MSI MS-7409 motherboard schematic at version 2.0, distributed as a PDF of about 837 KB. The name gives no date or chipset details. The drawings show the power regulators, standby supplies, reset and clock paths, letting a technician trace missing voltages, read component values and select test points when diagnosing a dead or shorted board. MSI uses MS-numbers for its own boards, and the number plus revision printed on the PCB should agree with this document. Any PDF viewer opens it.
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 @pepeelectronica. 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.