LED lamps are now very common, high brightness, low consumption, long life, and many styles, ranging from small LED bulbs to large chandeliers, have generally become LED light sources. However, the LED lights occasionally have the problem of not brightening, dimming and flickering when power is cut off. In fact, the structure of the LED light is very simple. If we find the problem, we can simply fix it.
The structure of the LED lamp
There are common ceiling lamps and ordinary small bulbs, each of which has a different style, but the internal circuits are similar. When we open the casing, we can see many small lamp beads, which are all strung together. The more lamp beads, the higher the brightness. Then there is a controller, that is, the driver plays the role of step-down, constant current, rectification and filtering. Some LED light drivers are external, and some are internal and cannot be seen.
LED light does not light analysis
Use an electric pen or a multimeter to see if there is electricity at the input, and the multimeter directly measures whether the voltage at the input is 220 volts. If there is no power at the input, there is a problem with the wires going to the LED bulbs. If there is power, check further. Use an electric pen to test whether the input terminal has power.
Then check the driver. Most of the cases where the light bulb does not light is that the driver is broken, the input terminal is normal, and a small light bead does not light up after the power is turned on, that is, the driver is broken, and the driver can be replaced separately. Professionals can open for repairs, and those who don’t can replace them with new ones.
LED lights dimmed
The small lamp beads are strung together, and then divided into several groups, and each group is in a parallel relationship. If a small lamp bead is broken, this group will not light up, but the other groups will still emit light normally, but the overall brightness will drop. If you can't observe which lamp bead is broken, you can use the diode gear of the multimeter to light up one by one with the red and black test pens to find out. After finding it, replace it with a small resistor or find another lamp bead to replace it.
LED light flashes when power off
Most of the reasons for this are caused by the switch controlling the neutral line. Find out the reason and adjust the line. Make sure that the neutral wire goes into the light and the live wire goes into the switch. There is also a switch with an indicator light. The weak current in the indicator light lights up the lamp beads, a weak light. In addition, the quality of LED lights is very rubbish, and they generate induced current. At this time, you may change to an incandescent lamp. If you don't want to use an incandescent lamp, buy a small relay and connect it to the circuit to absorb the induced electricity.