What are the common faults and solutions of LED lights?

What are LED lamps?

LED (Light Emitting Diode) is a solid-state semiconductor device that can convert electrical energy into visible light. It is called the fourth-generation lighting source or green light source. LED lights are gradually occupying the current lighting market with advantages of high brightness, low energy consumption and long life time. Generally speaking, LED lighting products are rarely with problems.

There are two types of LED lights on the market. One is constant current type and the other is resistance-capacitance type also called constant voltage LED light. Relatively speaking, constant current type is more stable. The constant current LED lighting product is with a controller, and the current is export stably. The structure of the resistance-capacitor LED light is relatively simple, and with voltage lowered to make the LED lamp bead works within the normal working current.

What is the basic structure of LED lights?

There are many types of LED lights on the market, LED tube light, LED bulb light, LED panel lights, LED flood lights, LED high bay light, LED street lights etc. No matter what types of LED lights, their internal structure is the same, all with 1) light source components that is LED lamp beads on PCB, there are actually many small lamp beads in the LED lamp, generally connected in series, and then several series are combined and connected in parallel; 2) housing component; 3) and driving components, the power supply, with the function of offer constant current and step down.

About the problem of LED lights, there are no more than four faults: the light does not turn on, the light is dimmed, the LED light is slightly bright and the light flickers Today we will analyze and solve each problem one by one.

Fault 1. The LED light does not light up

Step 1: Check the circuit

If the LED light does not light up, it is generally a circuit problem. Use an electric pen to measure to see if there is any voltage in the circuit. If not, it is the problem. If there is, continue to the next step.

Step 2: Check the driver

It may also because of the problem of driver. Light-emitting diodes have high requirements on current and voltage. If the current and voltage are too high or too low, they cannot be lit normally. They rely on the constant current driver, rectifier, step-down device and other devices in the driver. Try to change a new driver and check it again, and the problem can basically be solved.

Fault 2. The LED light become dark

When lighting, the light suddenly fades without any prompts, it should be a lamp bead problem. The lamp beads on each string are connected in series, and the strings are connected in parallel. If a lamp bead is burned, this string of lights will be disconnected and cannot light.

And which is easy to inspect, the burned lamp bead will be a obvious black dot that cannot be erased.

If only few lamp beads burned, you can use an electric soldering iron to weld the two soldering feet behind the burned lamp bead together, and the lamp can be used normally; if too many, you need to buy a new lamp bead board.

Fault 3: The LED light is slightly bright

Generally, this is the case with poor quality LED lights, and there is no attention to the lights at home, and the switch lights are on the zero line. LED lights are very sensitive and can be lit with a weak current. All households use electronic switches to turn off the lights and dim light. No matter what kind of situation causes the dim light, we can use a relay to solve it perfectly, because the relay Control the live wire and the neutral wire on and off at the same time.

Fault 4: The LED light flickers when lighting or after turned off.

Step 1, Check whether the neutral and live wires are reversed. Check whether the color of wire at the switch is red first, if not, the switch may control the zero line and need to replace it in time.

Step 2, Observe the flickering lights. If multiple lights in the room are flickering and they are in the same circuit, it should because of the reverse connection of the neutral wire and the live wire in the distribution box. Be sure to make a mark after the swap for future maintenance.

Step 3, It may be that the lamp produces a self-inductive current. In this case,  you need a 220V relay and connect the relay coil in series to the circuit to absorb the induced current.