A better way is to test with a multimeter or replace the test with the power supply and light panel of a good LED explosion-proof light.
Test of the LED light panel: turn the digital meter to the "diode" file, test the light-emitting diode on the LED light panel, and test in the forward direction, if the light-emitting tube is normal, or emits a weak light.
Observation method: If the light-emitting diode on the LED light panel is burned out, the light-emitting tube will look slightly black.
Replacement method: replace the original power supply with a normal power supply, if it does not light, it means that the lamp panel is faulty; replace the original lamp panel with a normal lamp panel, if it does not light, it means that it is a power supply fault.
Method 1: Use the diode test file of the multimeter to test each LED diode (forward, LED is on. Reverse, no light) Method 2: Most LED lights have a rechargeable battery inside, so the battery supplies the LED lights Power supply, use a multimeter to measure the battery (usually 4~6V). Cut the battery cord with scissors! Connect other electrical appliances, if there is no other electrical appliances, use one of the battery wires in between to quickly touch the other pole to see if there is a "spark" or "pop" sound. Special reminder, pay attention to safety!
Test it with a multimeter! If the forward direction is conductive and the reverse direction is not conductive, the general LED is good! Generally bad is broken down! The second is to connect the LED in parallel again to see if it is normal; if it can be determined that the lamp is good, then the drive is broken or the desoldering is loose.
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