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Three common faults and solutions of LED lights

Views:0     Author:Site Editor     Publish Time: 2021-08-09      Origin:Site


        LED lights are gradually occupying the current electric light market due to their high brightness, low energy consumption and long life. Generally speaking, it is very difficult for LED lights to cause problems. Among the problems of LED lights, there are no more than three problems: the light does not turn on, the light is dimmed, and it flickers after turning off the light. Today we will analyze and solve each problem one by one.

The structure of the LED light

There are two forms of LED lights, one is a ceiling light, the other is a bulb. Regardless of the type of light, the internal structure is the same, divided into LED chips and drivers.

LED chips

Open the shell of the ceiling light or the white plastic part of the bulb, and you can see that there is a circuit board full of yellow rectangles inside. The yellow on this circuit board is the LED chip. The LED chip is the luminous body of the LED light, and its number determines the brightness of the LED light.


The driver of the LED bulb is installed at the bottom, and it is not visible from the outside. The driver of the ceiling light is a black box, and the driver needs to be installed first when installing the light.

The driver has the functions of constant current, step-down, rectification, filtering and so on.

LED light does not light up the solution

When the light is off, you should first make sure that the circuit is ok. If it is a newly installed electric light, you should use an electric pen to measure, or install an incandescent light to see if there is voltage in the circuit. After confirming that there is no problem with the circuit, you can start the following maintenance.

Driver problem

The light doesn’t turn on, and it’s almost always a problem with the driver. Light-emitting diodes have high requirements for current and voltage. If the current and voltage are too large or too small, they cannot be lighted normally. Therefore, the constant current driver, rectifier, and step-down device in the driver are required to maintain use.

If the LED chips do not turn on after turning on the light, the driver should be considered first. At this time, you can purchase a new drive for replacement.

The solution to the dimming of the LED light

  This problem should be solved together with the previous one. This may be the case when the brightness of the light is dimmed or not bright.

LED chip problem

LED LED chips are divided into strings, each string is connected in series, and between strings are connected in parallel.

Therefore, if one LED chip on this string is burnt, it will cause this string of LED chips to not light up. If one LED chip in each string burns out, the entire light will not light up. If each string has a LED chip burned out, you should consider the capacitance or resistance on the driver.

The burnt LED chips and the normal LED chips can be seen from the appearance. The burnt LED chips have a black dot in the middle, and this dot cannot be wiped off.

Inside the red circle is a burnt light

 If the number of burnt LED chips is not large, you can solder the two soldering pins behind the burnt LED chips with an electric soldering iron. If there are too many burnt LED chips, it is recommended to buy a LED chip board to replace it, so as not to affect the brightness of the lighting.

LED lights flicker after turning off the solution

When the light flashes after turning off, first confirm the wiring problem. The most likely problem is the neutral line of the switch control. In this case, correct it in time to avoid danger. The correct way is to switch and control the live wire and connect the neutral wire to the light.

If there is no problem with the circuit, it is possible that the LED light has generated self-inductance current. The easiest way is to buy a 220V relay and connect the coil to the light in series to solve the problem. For specific reasons, see our previous article: Solutions for household electric lights to flicker after turning off the lights.