Gigabyte B450M DS3H WIFI desktop motherboard schematic, labelled R12 in a 1.43 MB PDF, most likely board revision 1.2. The micro-ATX AMD AM4 board can be followed through its VRM, standby rails, SPI BIOS flash, Super I/O and the Wi-Fi slot circuit. Open it in any PDF reader and use net names to trace a dead board or a shorted rail. Check that the revision printed on your PCB matches before using component values or designators.
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 @ShareMan_Electronic_Files. 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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)