ASRock B250M-HDV boardview at revision 1.03, a 451 KB ZIP archive. The B250 chipset places this micro-ATX board in the Intel 200-series desktop family for LGA1151 processors. Opening the extracted layout in a boardview tool such as OpenBoardView or FlexBV lets you locate the PCH, VRM controller, BIOS chip and test points, and follow nets when tracing a short or absent standby voltage. Compare the revision on the PCB to 1.03 first, as designators and placement can differ between board revisions.
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 @zinfo_desktop. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.