Schematic in PDF form for a board coded IPISB-AB, compressed into a 1.07 MB ZIP. No brand is given in the name. The IPISB-AB code is an OEM desktop motherboard identifier and should be checked against the PCB marking. With the drawings, a technician can trace VRM and standby rails, check the power-on path from the front panel header, and identify parts near a suspected short. Extract the archive and open the PDF in any reader. Confirm the board code and revision before relying on component values.
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 @schematicslaptop. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.