LED LAMP REPAIR

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LED, or LED lamps have recently entered our lives widely. And this is not surprising, since they have many advantages compared to other sources of artificial light.
Here are a few of them:
1. Profitability.
2. Durability.
3. Security.
Both the price and quality of these lamps may vary, depending on their manufacturer. They are not very different in design, the components are the same, but the difference may be in quality.
This is especially true for the LEDs themselves and the cooling system. Although the lamp does not overheat much, heating is still present, which adversely affects the electronics.
Therefore, breakdowns of these devices also occur. This is very unpleasant, especially when the lamp did not last even a couple of months. Nevertheless, do not rush to throw it away, There is a way to repair the lamp, thereby saving your money.
Here, in the photo, a medium-quality lamp.

One fine day, it stopped working, although the lamp itself was fully operational.
It is clear that the problem lies precisely in the lamp, more precisely in one of its components.
So, let's proceed to repair the lamp.
To disassemble it, you must remove the diffuser.

Below it is an LED panel and an electronic converter. The diffuser can be latched or threaded.
This lamp uses a threaded connection, and this is the best option for the possibility of repair, since it does not require special efforts and special tools for dismantling.
Just scroll it counterclockwise and the matte cap can be removed without any problems.
Under it, as already described above, there is a panel with several dozen LED elements.

To begin with, you can look at the external state of each electronic component on the converter itself.

Sometimes the cause of the breakdown may be in it. Most often, this is a bloating of a large capacity electrolytic capacitor. If traces of deformation are visible on its upper or lower part, then it is definitely necessary to change it.
Also, on this board there may be a normal fuse, which could blow out due to a voltage drop. Then the problem is solved by replacing it.
If no external defects are detected on the converter, measure the voltage at its output. This can be done with a multimeter or a simple DC voltmeter.

By the way, you can measure the voltage at the output of the converter without removing the LED panel. This should be done on the two wires leaving the hole. But first, you need to insert the lamp into the socket of some kind of table or other lamp.

As the voltmeter shows, the output voltage is approximately 132 volts. And this means that the converter itself is in good condition and the problem is precisely in the LEDs.

So, as their connection is serial, failure of at least one of them will lead to complete inoperability of the entire panel.
How to find one that is defective? If outwardly this is not visible, there is an effective method to find the problem diode.
We put the multimeter into dialing mode and connect its probes alternately, in parallel with each LED, moreover, the positive (red) probe of the device must be applied to the "-" pin.

On the panel diagram, the minus sign is not indicated, only the plus sign is marked. Therefore, not marked, and there is a cathode.

If the LED is working, when connecting the probes to it, a weak glow appears. That element that does not light up is faulty.

Next, remove this LED by picking it with a thin screwdriver.

After, gently tin its seats.
Now you need to find the LED to replace the burned out.
For this purpose, any working element is suitable, for example, from a flashlight with a problem battery or even from a lighter with a backlight.

Now where they just do not apply, so this should not be a problem.

In the same way as when searching for a fault, we find the positive and negative conclusions. Now solder the new LED accordingly to the polarity on the board.