Sony Vaio schematic for the MBX-149 motherboard, carrying the MS12 project code at revision 2.0. Sony labels its laptop mainboards with MBX numbers, which you will find printed on the PCB along with the revision. The 1.57 MB PDF is handy for tracing power rails, checking the power-on sequence, identifying the components around a failed section and testing for shorts to ground. Only rely on its values after confirming your board carries the same MBX number and revision, since other versions may have altered circuits.
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.