Sony VAIO schematic for the PCG-K23 notebook, built on the MBX-114 motherboard according to Sony's own MBX board numbering. The 1.23 MB PDF lets a technician follow power rails, charging and sequencing circuits, video output and connector pinouts when diagnosing a dead or no-display unit. Sony assigned MBX numbers to boards that were often produced by ODMs, so the number on the PCB is the reliable identifier. Confirm the MBX-114 marking before use; any PDF reader opens it.
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 @afsschematicfree. 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.