The LED headlights are turned off and there is a weak light, and it will dim after a while, what s g

Causes and solutions for LED lights that still emit weak light. LED is a solid-state semiconductor device that can convert electrical energy into visible light, that is, light-emitting diodes, which can directly convert electricity into light.

LED lamp beads.

At the heart of the LED is a semiconductor light-emitting diode wafer, one end of the wafer is attached to a bracket, one end is the negative end, and the other end is connected to the positive pole of the power supply, so that the entire wafer is encapsulated by epoxy resin. A single LED lamp can only work at low voltage (about 3V) and low current (about a few milliamps), and the light emitted is very weak. Many LED lamp beads need to be connected in series or parallel; At the same time, a single LED lamp bead is unidirectional conduction (single-phase conductivity of the diode), in order to make full use of the positive and negative semi-weekly current of the alternating current, this requires an integrated circuit chip, which converts the AC 220V power supply into voltage and current direct current, so as to meet the power supply requirements of the LED lamp bead aggregate, so that it can emit light normally.

LED lights, light stickers, light bars.

LED lamps require small current, are quite sensitive to voltage and current, and will induce light due to various complex reasons in use. So what is the reason why the LED light will emit a faint light when the switch is turned off, and what is the solution?

Finished LED lights.

1. The neutral line is electrified.

This is the most common case, because when the plumber is arranging the wire, the live wire goes directly into the lamp base, and the neutral wire goes into the control switch. This causes the switch to be disconnected, but there is still a current passing through the light to reach the switch, which causes the light to be slightly bright. Workaround:

In this case, adjust the wiring so that the switch controls the live wire.

The switch controls the neutral line, causing the current to flow through the lamp.

Because the plumber connected the wrong line when the main gate entered the line, and the fire zero line was reversed, this accidentally reversed all the fire zero lines, causing all the switches to control the zero line. The solution to this situation: only need to swap the incoming wires.

The switch correctly controls the live wire.

If the switch controls the live wire, uses the traditional mechanical wall switch, or emits light, the neutral wire is electrified. It is a very common phenomenon that the neutral line is electrified. If the neutral line is not well grounded, the transformer three-phase load is unbalanced, the line is too long, the wire diameter is thin, or the neutral line current is too large, it will cause the neutral line to be electrified.

Solution: Re-grounding the neutral line or carrying out low-voltage renovation (this needs to be conveniently solved by the property through the electricity supply company).

2. There is a wiring error in the dual control switch.

Wrong connection, although it can also be used.

There are several wiring methods for dual control switches, if the wrong connection is used, it will not light up for traditional incandescent lamps, but for LED lights, because it is actually direct current, it will be slightly bright after turning off the lights. The solution to this situation is to install the normal control live wire connection and rewire.

Correctly connected, any switch can cut off the power supply.

Wiring method of double control switch: single double control switch, there are three contacts behind it, which are L, L1, L2.

The LED light is turned off and the weak light is the problem of the switch, some switches still have a small current flowing after disconnection due to the luminous display, resulting in the LED is slightly bright; There are also segmented switches and voice-activated light switches that are electronic switches, and in the case of off, they are also leakage; In addition, some switches may leak slightly due to design or moisture. The above leakage will not be bright for energy-saving lamps and incandescent lamps, but the luminous efficiency of LEDs is extremely high, and there will be a slight brightness. Such brightness costs almost no electricity, so don't mind.

If you want to repair, you can only start from the switch, which is generally replaced.

This is the reason why the internal capacitors store the charge, which can be solved by parallel resistors.

In life, almost every family of us is equipped with LED lights, when the LED lights are turned on, they will emit all kinds of light, very beautiful, many people are loyal to the LED lights, but we should all notice that when we turn off the LED lights, we will find that the LED lights will also emit weak light, what is going on? Many people are more interested in this problem, and today I want to introduce to you the reasons for the weak light after the LED light is turned off, as well as the solution. It's very practical, so listen carefully.

One: the reason why the LED light is turned off and still emits weak light.

1: The switch is to the zero line.

In fact, electricians almost do not make this kind of mistake, but in fact this kind of problem often occurs, and the zero live line of the whole house is all reversed, this situation is generally caused by the change of the outside zero live line, as long as the bus at the main switch at home is changed, the problem can be solved.

2: The neutral line is electrified.

This situation is very common, which is why you use an electric pen to measure both lines will be lit. As long as the neon bulb of the electric pen has a voltage of twenty or thirty volts, it will be lit, so the general electrician still likes to use a universal meter. The reason why the neutral line is charged is generally caused by the neutral drift of the transformer, and the neutral drift leads to a non-zero voltage.

You can do an experiment, you put the neutral line against the wall, and then the electric pen will not light up. It can be said that 90% of the reason why LEDs are bright is because the neutral line is electrified.

Two: How to solve the problem of weak light when the LED light is turned off.

1: It is definitely not practical to repair the transformer, that can only work on the lamp, you can insulate your LED lamp and the wall, and install a plastic pad between the lamp floor and the wall (I have tried it in the actual installation, and the effect is obvious). Another option is to install a relay inside the lamp and disconnect the neutral wire at the same time (because the neutral wire is straight in the lamp installation).

2: First of all, turn on the main switch of the light to see if it will be on, if it is still on, it may be the power supply taken from the socket circuit breaker, and then pull the socket switch, and the light can be on.

The above is the reason why the LED light is turned off and still emits weak light, there are two reasons, one is that the switch gate is pressed to the zero line, when this happens, as long as the bus of the total switch in the family can be changed, it is very simple, however, it is best not to do it yourself, to invite an electrician, the other reason is that the zero line is electrified, this, according to their own choice, to see whether to add an insulator, or add a power breaker. That's it for the introduction.

If you want not to emit light, you need to solve the leakage current or induced current of the LED circuit, and you need to completely cut off the live wire, and the line connected to the LED is far away from the live wire, so there will be no induced current. In addition, the quality of the driver of the LED lamp should be better, the switch should not only cut off the live wire, the leakage current of the switch should also be small, and the wall of the wiring should not be wet. Because the LED lamp is very sensitive to the current, the weak leakage current or induced current is enough to make it glow, especially in the dark night, but this current is extremely weak, the brightness is also very dim, will not have any impact on the life of the LED, and the power consumption is small.

It can also be used as a night light. If the distance between the circuit connected to the live wire and the circuit of the LED is too close, even if it is not connected, the current will be induced by the space electromagnetic field, so it is necessary to pay attention to the wiring. No low-quality LED drivers and luminaires.

Even if the LED light is turned off, as long as it still emits weak light, it will consume power. When the LED light is turned off, there will generally be no light source, and if there is a light source, it is generally caused by electronic switches such as switches, segments, and voice control. Although the leakage current is in the microampere level, the light can still be seen due to the extremely high luminous efficiency of the LED.

The power of the LED light is milliwatts in the low-light state, and the meter will not measure such a small power consumption, but there will be electricity expenses when it accumulates a lot, even if there is consumption, it is less than one yuan a year.

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The switch is slightly leaking, and the switch is replaced.

The switch is connected to the n zero line, when the switch is turned off, the lamp is still connected to the live wire, and it will be du

Glows faintly.

The DAO solution: adjust the circuit and let the switch control the live wire.

In most cases, the light switch is installed on the zero line, the switch is off, the live wire is still connected, and the light is always in a live state, so the light will be slightly bright after the light is turned off. This situation is not only in LEDs, but also in ordinary fluorescent lamps.

Look at the LED lights around the house at night, if only a certain LED has this situation, the above method is used to control the live line, then it can be concluded that it is the driving problem of the LED power supply of the lamp; You can call the after-sales service of the lamp to seek a solution.

Then there's the line!

Swap the two wires under the switch of the lighting switch of the distribution box at home to ensure that it is no longer on. The reason is that the lighting wire itself is reversed, resulting in the LED at home can sense a weak current. Pay attention to safety when adjusting the line, and pull down the opening and closing to ensure safety.

The neutral line of the light switch and the live wire are reversed, that is, the switch controls the neutral wire. This will cause the light to be turned off, but there will still be voltage at both ends of the light. After passing through the electric lamp, the live wire will form an AC loop through the distributed capacitance of the remaining neutral line segment and the earth (the distributed capacitance is formed when the two wires are close to each other and insulated from each other), which will make the high-sensitivity LED lamp still have a faint light.

In this case, when repairing the luminaire, it is easy to cause injury to the maintenance personnel because the live wire is always live.

Some users have reported that when the remote control LED light is turned off, the light will glow slightly. When turned off with a mechanical switch, the light does not emit light.

This is due to the fact that the internal controller of the luminaire is misconnected to the neutral line, which is due to the above reasons. This kind of failure usually occurs in inferior lamps, and this does not happen to remote control lamps produced by regular manufacturers. At this time, you can consider replacing the electric light, of course, under this kind of failure, it will not be much of a problem.

When the two ends of the lamp are connected to one fire and one zero two wires, the light will be on normally. When both ends of the lamp are connected to the live wire at the same time, the lamp will never come on, nor will it dimly light or flicker. The lights will not come on, and the lights of poor quality and some so-called ultra-bright lights will appear faint or flicker.

It is a situation that the zero live wire is reversed, but there is a more important situation caused by the structure of the circuit, such as the switch part of the wire tube in which there is only one live wire and a temper wire, both of which are turned on and the lights are turned on, and the lights are turned off, which is conventional;

However, due to the high sensitivity of LED lights, when the wire is disconnected, although there is no current flow, everyone ignores that there is a non-negligible capacitance in such a circuit, and there is a weak current passing through the AC circuit, which is enough to excite the LED lamp beads to shine.

The capacity does not need to be too precise, and the pressure is enough

LED light is slightly lit when the light is turned off:

1. The switch cuts off the zero line, and the line can be replaced.

2. There is induction electricity in the shared change. Add a switch to cut off the neutral line.

3. It can be used in conjunction with a switch with an induction or an indicator light.

It doesn't cost electricity and has no effect on the light, so it's okay to ignore it.

It could be that your switch is not installed above the live wire. Use a tester to test whether the wire with the switch is a live wire or a neutral line. If it is installed above the zero line, it can generally solve the problem.

This is because the lamp holder of many lamps is made of iron, and the chip of the lamp is easy to ground the top of the room through the lamp holder, so that the induced electricity flows to the top of the room through the chip, so the chip is on. Therefore, it can be easily solved in only two steps, first: a layer of foam is placed between the base and the top of the room to avoid direct contact between the two, and it can also reduce the current sound; Step 2:

Generally speaking, if there is still bright and weak light after the LED light switch is turned off, it can generally be considered as follows: the switch is a field effect transistor, and the leakage current caused by the defect caused by the original still has a weak passage.

For this situation, there is no other good way, unless you make a fuss directly on the socket of the lamp, for example, find a socket with a switch, so that you can directly switch on and off the lamp through the switch, and there is no leakage current, of course, if this method feels that it is not possible, there is only one way to repair.

If you buy it for a short time, it is recommended to go directly to the after-sales service.

The LED light is slightly bright after the light is turned off: 1, the switch cuts off the zero line, and the line can be replaced.

2. There is induction electricity in the shared change. Add a switch to cut off the neutral line.

It doesn't cost electricity and has no effect on the light, so it's okay to ignore it.

**Shop MLS Mulinsen Lighting Guangzhou

The switch is connected to the neutral line, connect the switch to the live line.

The lamp has leakage or induction electricity, and the lamp is defective and needs to be replaced.

Make sure the light fixture is not touched to the ground.

Causes of low light:

1.The switch is connected to the neutral line, causing the zero live line to be reversed.

In fact, as long as the bus at the main switch at home is changed, the problem can be solved.

2.The neutral line is live.

Solution:1Pull down the main switch of the light first to see if the light is still on. If it is still on, it may be the power taken from the socket circuit breaker, and then pull the socket switch down, it should not be able to light up.

2.After confirming the fault, turn off the fault light switch and disassemble the switch with the power switch pulled down. Test with an electric pen to see if there is electricity to determine whether the neutral line is the live wire. If it is indeed connected to the neutral wire, then it is enough to connect the live wire to the switch.

The power must be cut off during operation, and the power can be temporarily transmitted when judging whether the live wire or the neutral line is judged.