2. Check the input voltage: Use a voltmeter to measure whether the input voltage is normal. If the input voltage is lower than the rated voltage range of the power module, a fault may occur.
3. Check the power switch and indicator: Check whether the switch is on and the indicator is on . If not, it may be a switch fault or other internal fault of the power module.
4. Check the output voltage: Use a voltmeter to measure whether the output voltage of the power module is normal. If the output voltage is abnormally low or zero, it maybe the output circuit faulty of power module.
5. Check the protection circuit: Some power modules have overcurrent or overheat protection. If the power modules are overloaded or overheated, they may shut down automatically. Wait for the power module to cool down and return to normal before discovering the fault.
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