Sony mainboard schematic identified only by the code mbx247hk1 in the file name, which follows Sony's MBX board numbering, likely MBX-247. The trailing hk1 is unexplained, and the VAIO model is not stated, so confirm compatibility from the board itself. The 1.02 MB PDF can be used to trace power rails, the charging and power-on circuits, and signal paths between major chips. Before relying on it, compare the MBX number on the motherboard silkscreen; Sony MBX codes that differ by one digit are separate designs.
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 .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.