AO4423 datasheet in PDF format, 238 KB, from Alpha and Omega Semiconductor. The AO4423 is a P-channel MOSFET in an SO-8 package, a type frequently found in charger input and power-path circuits on laptop boards. The document specifies pin functions, gate threshold, on-resistance, drain-source voltage limit and thermal data. With it you can work out which pins to probe, judge whether a measured gate voltage should switch the device on, and choose an equivalent part if the original is burned or shorted.
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