Mitsubishi Electric, original

The Mitsubishi Electric M51387P is a 3-channel video amplifier IC. it is used in the Nanao MS9-29, Nanao MS8-29FN22, and Nanao MS-2930 monitors. It is responsible for DC restoration, video bias and gain adjustment, pedestal level / clamping, and blanking.

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🔗 "Soft" horizontal edges

A sign that the IC should be replaced is that the falling time for a signal has been prolonged, resulting in a slight "fade" instead of a hard edge. This can cause a monitor to seem soft in focus, even if the focus and heater voltages are correct and the tube is in good condition.