Sony VAIO VGN-SR55E schematic covering the MBX-190 motherboard, with M750 also given in the name, likely a project or model code. Sony's MBX numbers identify the board internally, and the ODM is not stated. The 1.60 MB PDF serves for following the power sequence, measuring rails against expected values and tracing signals between the chipset and ports. It also helps pinpoint shorted parts. Confirm the MBX label on your board before trusting the component 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 @schematicslaptop. Enginerys does not host this file.
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How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.