The core components of the LED lamp are the lamp board and the driver, which are also the most prone to problems.

1. Distinguish the failure of the light board or the failure of the driver

First of all, we need to find out whether the lamp board is faulty or the driver is faulty. The method is as follows:

Use a multimeter to adjust to the voltage level, and measure the voltage at the output end of the driver, that is, the voltage between the two wires connected to the light board. If the voltage is normal, there is no problem with the driver, and it is confirmed that the problem with the light board is the problem. If the voltage is not normal, then naturally it is the driver's problem. At this time, the lamp board should also be tested to prevent the lamp board and the driver from being damaged together. The lamp board can be measured by the buzzer gear.

2. LED light board fault finding

When it is determined that it is the fault of the light board, you can find the location of the specific fault. LED light boards are generally composed of multiple LED light beads connected in series. If one of the light beads is damaged, all the light beads will not emit light. So we just want to find the damaged lamp beads.

To find the fault of the lamp bead, you can first observe it visually. Some black lamp beads are burnt out, and there may be one or more than one. Secondly, you can use a multimeter to measure one by one. Note that these lamp beads are actually light-emitting diodes, which are divided into positive and negative poles. Without a multimeter, you can also apply direct current to both ends of the lamp bead to determine whether it emits light. This method can basically detect which lamp bead is faulty.

3, drive fault finding

For the LED driver, it is mainly to judge whether the line is connected in a virtual way. We generally do not need to search for other electrical components. There are not a few electrical components, and there is no maintenance value.

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