Three common faults of LED lights and corresponding solutions

Three common faults of LED lights and corresponding solutions


LED lamps are gradually occupying the current electric lamp market due to their high brightness, low energy consumption and long lifespan. Generally speaking, it is very difficult for LED lights to cause problems. Among the problems with 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 lamp, the other is a bulb. Regardless of the type of lamp, the internal structure is the same, divided into lamp beads and drivers.


Lamp beads

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



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

  The driver has functions such as constant current, step-down, rectification, and filtering.


Solution to the LED light not bright

When the light is off, you should first make sure that the circuit is ok. If it is a newly installed electric lamp, you should use an electric pen to measure, or install an incandescent lamp 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.


Drive 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 lamp beads 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 needs to be resolved by contacting the previous one. This may be the case when the brightness of the lamp is dimmed or not bright.


Lamp problem

   The lamp beads of the LED lamp are divided into strings. The lamp beads on each string are connected in series, and the strings are connected in parallel. Therefore, if one lamp bead on this string is burnt out, this string of lamp beads will not light up. If one lamp bead in each string burns out, the entire lamp will not light up. If each string has a lamp bead burned out, you should consider the capacitance or resistance on the driver.


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


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


The solution to the flickering of the LED light after turning off

   When the light flashes after being turned 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 lamp 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.


In more than half of 2017, what is the trend of the LED lighting industry?
In more than half of 2017, what is the trend of the LED lighting industry?
Due to the large market space in my country's lighting industry, the entry barriers for low-end product industries are relatively low, especially after the rise of LED lighting, a large amount of social capital has poured in, thus forming an industry competition pattern with relatively low industry concentration and fierce market competition .
The concept of sharing has long been
The concept of sharing has long been "rooted and sprouted", but the LED display is long overdue
Nowadays, the fast-developing information society also allows LED displays to have broad application prospects in various fields.
In the second half of 2017, where should LED lighting companies go?
In the second half of 2017, where should LED lighting companies go?
In the blink of an eye in 2017, more than half of the year, entering June, lighting companies have summarized "the gains and losses in the first half of the year" and set out to lay out the "development plan for the second half of the year."
LED industry concentration is increasing year by year, investment enthusiasm remains unabated
LED industry concentration is increasing year by year, investment enthusiasm remains unabated
In the beginning of 2017, Mulinsen invested 1.035 billion yuan in the Xinyu LED lighting accessory project; Guangpu shares, which successfully transferred from the New Third Board to A shares, invested 132 million in the LED lighting product expansion project on May 25 ;
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