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BQ24133: Chip damage problem

Part Number: BQ24133

We accidentally damaged the chip while using BQ24133. We test the damaged chip and find that it is VREF, SW, CELL, SRN pin abnormality. 

In use, we plug in the battery first and then the main power supply. The lithium battery is 12.6V. The main power supply is VDD15V. 

Below is the schematic diagram. Can you help us analyze what went wrong?