It is judged by the output voltage and current of the power supply chip.
Because the power supply chip is used to stabilize the voltage and control the current, if the chip is damaged, it will lead to voltage instability or the current is too large and too small, which affects the work of the entire circuit.
If you want to test the quality of the power chip, you can use a multimeter or oscilloscope to measure whether its output voltage and current meet the specifications.
Temperature test, short circuit test, etc., can also be carried out to further confirm the working status of the power chip. It should be noted that the test power chip should be carried out in accordance with its instructions and technical specifications, otherwise it will affect the test results and effectiveness.