Circuit schematic for the Sony Vaio MBX-143 motherboard; the name gives no retail model or revision. MBX is Sony's own board numbering, used even when the design was outsourced to an ODM, and the label is usually printed on the PCB. The PDF lets a technician trace power rails, measure at the correct points, follow signal paths and locate components while diagnosing faults. Check the MBX marking and the revision on the board before relying on component values, as variants within one MBX number can differ.
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