LED Lights Not Working: Common Reasons And Top Solutions

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LED Lights Not Working Common Reasons And Top Solutions

When the LED lights burn out, how to deal with it? What to do when the LED light flicker? How to handle LED light overheating? What about LED ghosting? In this passage, you can find the most common problems with LED lights, know the reasons for LED light not working, and learn the best way to fix them!

LED light not working but has power

  1. The positive and negative poles of LED lights have been inverted. In general, the voltage measured after reversing the connection is the no-load voltage. If this is the case, reconnect the LED light by reversing its positive and negative poles.
  2. The output terminal wire is not securely attached. This is equivalent to an open circuit for the LED light, and the tested voltage will be reported as the no-load voltage. You need to reconnect the output terminals.
  3. The real load does not match the power output. LED driving circuits may fail if the real power is higher or lower than the rated power.
  4. A short or open circuit will make the LED light unable to light up. In this case, contact a professional to fix the circuit.
  5. LED light beads can burn out or get damaged over time, just like other electronic components. If the issue is not due to the power supply or circuit, check if the light is damaged. One method is to do “comparison testing” by comparing suspected faulty lamp beads to normal ones.

Only half of my LED lights are working, why?

Individual lamp bead failures in LED light modules will not influence other lights, but will cause the lights to dim. Common reasons for their faults include:

  • Moisture: Moist LED lamp beads fail to illuminate or are insufficiently bright. This is a common storage issue with LED lamp beads. Producers normally will help customers bake them a second time before they can be used again.
  • Damage: A burned lamp bead will show a black spot on its surface. If only one or two lights are broken, order the same type and replace them. If there are a considerable number of damaged lamp beads, you should replace the board.

LED light strips are usually divided into sections. The lights in each section are connected together in a series, and the sections are connected in parallel. If one of the lights in a section burns out, it will make the section stop working. In this scenario, you can modify or cut away the unlit section.

Why are my LED lights flickering?

  1. If the LED light and driver specs do not match, the bulb may not be able to withstand high current, causing the light to flicker. To resolve the issue, replace an appropriate driver for the lamp.
  2. After using the LED bulb for some time, the driver is likely to fail. Changing a new driver may help fix the problems with LED lights.
  3. If the driver has an over-temperature protection function, it will protect the circuit in cases where the LED lights have poor heat dissipation. This causes the light to flicker. If so, you should improve the lights’ heat dissipation capabilities by modifying the casing, adding heat dissipation components, and so on.
  4. LED lights can flicker if they are used in a moist environment. Over time, the moisture can damage the light and the driver. If your driver is waterproof, you can replace the LED light.

How to deal with LED ghosting?

LED ghosting means that the LED light will still emit weak light after being turned off. The reasons for LED ghosting and the ways to solve it are:

  1. One common reason is that the switch is wired incorrectly. The switch should control the live wire, not the neutral wire. When the switch is turned off, the lamp that is connected to the live wire will emit a faint light. The solution is to change the wiring so that the switch controls the live wire.
  2. Some LED lights are made with cheap components that can cause problems. For example, some lights use low-quality drivers that can leak electricity, which can cause the light to flicker or stay on even when it is turned off. Also, copper cladding substrates and capacitance effects can both induce light leakage. You need to purchase new lights of guaranteed quality.
  3. Some LED lights have electronic switches with indicator lights. These lights can stay on even when the switch is turned off because a small amount of electricity is still flowing through the switch. Changing the switch or connecting a resistor in parallel to the lamp’s incoming line are the two possible solutions.

What to do with LED lights overheating?

LED lights can overheat for a number of reasons, including poor design, high temperatures, and other factors. Here are some aspects you can consider to solve the problem of LED lights overheating:

  1. First, optimize the heat dissipation design. When purchasing LED lights, you can select products with superior heat dissipation designs, such as those with aluminum alloy heat sinks and large-area heat dissipation holes. During the installation procedure, keep the lamp at a set distance from the wall or other objects to aid in heat dissipation. Heat dissipation design is especially important for outdoor LED lights like LED street lights.
  2. Second, keep the ambient temperature under control. When installing LED lights, try to avoid placing them in direct sunlight or in high-temperature enclosed spaces. If the temperature is high, try employing cooling equipment like air conditioners or fans to decrease it.
  3. In addition, regular lamp cleaning is an efficient strategy to reduce heat generation. Dust and debris on the lamp’s surface will reduce heat dissipation, so cleaning the lamp is necessary.


In the above passage, we have discussed common faults of LED lights, which include LED lights not working, flickering, ghosting, and overheating. We have also mentioned some useful tips for you to solve the problem yourself. But still, for some operations, you need to ask professionals for help. Casyoo is always here for you when you encounter any troublesome problems with LED lights and need new ones. Contact us now!

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Victor Guo

Victor Guo

Lead electrical engineer with 17+ years of experience designing electrical street lighting systems, monitoring electrical-related work at site, and discussing proposal and lighting implementation options. Bachelor’s degree in electrical engineering. Knowledgeable in LED lighting design, project management, safety and compliance.
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