Sony VAIO schematic for motherboard MBX-202, M790 design, provided as a 788 KB PDF. Sony identifies its laptop boards with MBX numbers printed on the PCB, which should match before using the diagram. The document shows power rails, regulators, signal paths and connectors, allowing a technician to trace missing voltages, locate a short and work through the power-on sequence. Any PDF viewer opens it. Note that component designators and values can differ between board revisions, so cross-check with the physical board.
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 @LaptopSchmatic. 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.