1. First of all, we need to make sure that there is no problem with the circuit of our own LED lights. The main problem is the switch, which is our detection focus.
2, check the power converter on the back of the LED lamp, this converter is directly removed, and then electrified with a multimeter to measure the voltage or current on the line, if the power converter is damaged can be directly bought to replace, this is generally very cheap.
3. If there is no problem with the power converter of LED lamp, then we can cut the multimeter to the voltage output gear and put it on the positive and negative poles of corresponding LED lamp beads to see whether it will be on. If it is not bright, it can be replaced directly.