ASUS X451CA motherboard package in a 554 KB ZIP, with no revision indicated in the name. The contents are not described, so unpack it to see whether it holds a boardview, a schematic or firmware. A separate rev 2.0 file exists for the same model, so compare the revision printed on your PCB with the material inside. Layout and schematic data let a technician follow the power sequence, find test points and locate failed components. If a BIOS image is included, back up the original chip first.
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 @ITHINKHS. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.