Circuit diagram set for the Sony VAIO motherboard MBX-202, also labelled with the project code M790, supplied as a 779 KB PDF. Sony uses MBX-series numbers on its VAIO boards, while project codes such as M790 usually identify the internal design name. Technicians use these sheets to trace voltage rails, find the source of a short to ground, read power sequencing and check connector pinouts. Verify the MBX number silkscreened on your board matches before relying on component values or net names.
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The standard format for schematics, block diagrams, power-sequence charts and service manuals.