1. The function and definition of each pin of this chip need to be determined first
2, Detect whether the power output pin has normal voltage, determine whether there is a break
3, measure the ground resistance value, determine whether short circuit
Two other intuitive ways to judge are:
1, after power, use the hand to sense whether the chip surface temperature is too high. Fast heating and high temperature indicate short circuit inside the chip.
2. Observe whether there are ablative points or cracks on the surface of the chip.