Schematic PDF of about 915 KB labelled with the project code M9A0 and MP, which stands for mass production, so it should reflect the final board design. The name gives no brand or board number, although the code style resembles other Sony VAIO M-series projects; that is not confirmed. Open the title pages to read the model and revision, check them against the PCB, and then use the drawing to trace power rails, locate fuses, inductors and test points, and follow key signals.
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.