BA50 boardview file at revision r20, compressed to about 266 KB. No manufacturer or laptop model is given in the name, so the BA50 marking and revision on the board itself are the only way to confirm a match. Component placement and nets differ between revisions, so do not mix this with the r13 or r22 versions. Use it in OpenBoardView, FlexBV or a similar viewer to locate parts, follow signals across the board and pick convenient points for measuring voltage or resistance.
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 @LaptopsBoardview. 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.