most likely it's shorting the 3.3 v-rail to ground. for example, you can check caps near the super-i/o for shorts, sometimes the chip itself will get hot if charger is plugged in or you inject voltage. in some cases, the chip is exploded and looks suspicious under the microscope or in macro mode... other things are to check the pins (via datasheet) and compare the readings/voltage-output. especially lenovo systems with the quadrangular charger and destroyed charging port/charger plug have a bad i/o-chip. in this scenario, the 19 v-rail touch the middle pin and will straightly fry the ic. it's just a bad design by the manufacturer...
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