1After the LED light is turned on, some light beads are not lit. Basically, it can be judged whether the lamp bead is damaged. Damaged lamp beads are generally visible to the naked eye-there are black spots on the surface of the lamp beads, which proves that they have been burned. Sometimes the lamp beads are connected in series first and then in parallel, so the loss of the lamp beads will lead to the lamp beads not being bright. Slight damage If only one or two lamp beads are damaged, we can repair them in the following two ways: 2. Find the damaged lamp bead, connect the metal at both ends with wires and short circuit. The effect of this is that most of the lamp beads can be lit normally, and only the damaged single lamp bead is not lit, which has little effect on the overall brightness. If you have strong hands-on ability, you can buy the same kind of lamp beads online (a big bag 10 yuan) and replace them yourself-heat the old lamp beads with an electric soldering iron (blow them with a hair dryer for a while) until the glue on the back of the old lamp beads melts, and take them out with tweezers (don't use your hands, it is too hot). At the same time, install new lamp beads while they are hot.