Boardview for an ECS board referenced as B40IAX, with an mb40ia_rb1 label that likely marks the MB40IA design in its RB1 revision. The name does not state the device model, so identify the board by the markings on the PCB and compare them with the file. It is a 1.94 MB RAR archive. Once extracted, open the layout with a boardview viewer to locate components, see net connections and choose test points for measuring rails or tracking down a shorted part.
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 @BoardSchematic. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
7-ZipWinRARThe Unarchiver (macOS)