How to repair the LED lamp yourself?

Getting acquainted with the device LED light bulbs

Before you start repairing bulbs at 220 or 12 volts, you need to familiarize yourself with its device. As already mentioned above, the design is extremely simple. The lamp can be conditionally divided into three parts: a casing with a cap and a light filter, an LED power board, an LED module.

Having disassembled the case carefully, the interior of the electronic circuit opens before you. Most of the Chinese manufacturers of inexpensive devices, such as "corn" and similar LED light emitters, install transformerless capacitor current sources. In these circuits, the capacitor acts as a current and voltage limiter.

For the reader's note, let's say that the operating voltage of one LED is 3.3 volts, and the current of the semiconductor crystal is about 20-50 μA, depending on the type of diode. If these parameters are overestimated, the diode will overheat and the crystal will break, it will fail.

How are LED bulbs arranged? Consistently in a chain of 50 - 60 LEDs are welded together, together forming a light-emitting element at a voltage of 180 volts. A power capacitor with a resistor limits the current and voltage to the required level.

Often the manufacturers of such devices go to deliberate fraud, and here's what: if you increase the current through the crystal above the working rating, but within reasonable limits, then the radiation from the diode will increase. In connection with this, heat release will also be higher, with which one can struggle for a short time. This trick advantageously distinguishes them against the background of competitors, because of greater brightness with the same claimed power. However, it results in a drop in light emission or destruction with time and a bitter disappointment of the user.

How to fix an out of order item?

So, having an idea of ​​the electronic circuit arrangement of our LED lamp, which does not work, consider how to repair it at home.

First of all, we perform a visual inspection of the chip and the diodes themselves. In 80% of the cases, a burnt out LED is a failure. To carry out repairs, you must first find a diode that visually differs from the others, for example, by the presence of a pronounced black point, as shown in the photo below, after which you replace it with a new one.

Video tutorial on repairing an LED light bulb in which the LED burned:

socket. A current-limiting resistor may also burn out. Rarely the working capacitors fail, breaking down the remaining elements of the LED device by their failure.

Once you study this page, we hope that you have a soldering iron and minimal concepts in electronics. Now about the method of troubleshooting. A diode check is possible with both a multimeter and a crown with a limiting resistor of 1 kΩ.Alternately placing wiring on the terminals of the LED, the serviceable will shine. The multimeter in the continuity position will also cause the LED to glow if polarity is observed.

If the problem is not detected with the light emitter, we check the limiting resistor for the tester, in most circuits its nominal value is about 100-200 ohms. More difficult repair is recommended to watch on the video:

Also a scourge of modern schemes is such a thing as "cold soldering".This is when, in time, contact breaks down in a poorly soldered tin soldering site.

The circuit breaks down physically and breaks the integrity of the circuit, as a result of which the LED lamp does not turn on. Repair the breakdown by re-heating the contact point with the flux applied to it.

Rarely occurring faults are the breakdown of a rectifier diode or capacitor that happens during voltage surges. With the help of a tester, you can install it thoroughly. Having identified the cause and replacing the burnt out element, you can return the operating condition to the bulbs. For more details on how to check the capacitor, you can in our respective article.

In more expensive LED devices, instead of a capacitor power supply, there is a switching power supply that automatically adjusts to the voltage in the network, and regulating it, the output keeps a constant value of voltage and current, preventing the crystals from overheating, providing long service and constant luminous flux.

The method of troubleshooting is practically the same as above, and most likely it will be cold soldering on any of the elements. Repair of the LED lamp in this case is not difficult.

If the diode bulb does not light up or flickers, it's not always the reason for its malfunction. In most cases, the flashing is due to the fact that it is connected to a light switch. In this case, you can solve the problem by replacing the switch with a normal one. Also as a repair, you can consider another simple way to fix the problem - turn off the light on the switch, disconnecting the diode bulb in it.

Idea for home masters

After reading our article, you may have such a question, but can you collect such a light source yourself? It is possible, that's exactly what I did, before I started using the factory LED, and then due to the specificity of the chandelier and the design. Using a LED tape and a converted electronic transformer, a lamp was produced on the desktop with two modes of operation. Later a night light was produced on one powerful three-volt diode and an ornamental sconce from the twine.

Also you can learn about how to make a LED light bulb in our separate publication. We hope you are interested in this article, not only the opportunity to repair the LED lamp with your own hands, but also the idea of ​​creating beautiful and unusual light sources!