Boardview for the BA50 mainboard at revision r22, delivered as a 267 KB RAR file. The name gives only the board code and revision, without a laptop model. Boardview data shows part placement and net connectivity, which helps when hunting for a shorted component, checking which pins share a rail or finding a convenient measuring point. Load it in FlexBV, OpenBoardView or a similar viewer. Several BA50 revisions exist, so match the revision silkscreened on the PCB, as layouts can shift between them.
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 .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.