Circuit diagrams for the Sony VAIO VGN-CR series on the MBX-177 mainboard, provided as a 1.39 MB PDF with no revision stated. MBX numbers are Sony's own mainboard designations, printed on the PCB, and should be verified before use since a series can span several boards. The schematic lets a technician follow DC-in and battery charging, the main voltage regulators and the power-on sequence, and locate parts connected to a rail that is missing or shorted to ground.
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