Schematic marked Sony GD1A in PDF format, 733 KB, with no VAIO model or MBX board number in its name. The GD1 code follows the Quanta project naming used for many Sony boards, and the A suffix seems to separate it from a related GD1B document. It suits tracing power and signal paths, checking regulator circuits and identifying parts on a shorted rail. Open it with any PDF reader, and confirm the Quanta code printed on the motherboard matches before relying on its values.
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 @cyberlanelectonik. 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.