Sony schematic for the MBX-237 motherboard, version 030 according to the file name, in a 2.73 MB PDF. MBX numbers are Sony's own codes for VAIO notebook mainboards. The laptop model is not stated, so identify the machine by the MBX code on its board. The diagram helps trace power rails, check the startup sequence, and find the components linked to a short or a missing voltage. Make sure the MBX number and version on the PCB match before relying on part 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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The standard format for schematics, block diagrams, power-sequence charts and service manuals.