Phone died suddenly when charging

Got a S7 edge today. Customer said it wasn’t charging or turning on. I opened it up and connected a S7 battery (same voltage, but 3000mAh instead of 3600mAh) after checking if it was shorted and the phone powered up and I could press her passcode. So I connected her old battery and tried charging and it started charging with 1.3-1.4A at 0%. Then all of a sudden it just stopped charging and did nothing afterwards. It also doesn’t power up anymore. Anyone encountered this on a S7 edge or other samsung phones before? Have I fried the charging IC perhaps.

tried connecting it to a power supply. It draws 60-70mA when pressing the power button and back to zero when you release it.

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