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How to solder LEDs with an iron

Nowadays, SMD LEDs are increasingly being used. In household bulbs, LEDs 2835, 5530, 5050 are mainly used. The printed circuit board consists of an aluminum plate on which an insulating material is applied. On the insulator there are tracks with spots on which SMD LEDs are soldered.
Do not resort to the help of a soldering iron. We don’t even use a blow dryer. Let's try to replace the LEDs with a conventional household iron. We take the iron from the wife, girlfriend, mother, and forth. The iron will not suffer.

Consider the example of repairing rulers with 2835 format LEDs


How to solder LEDs with an iron

I have an old Soviet iron, I transfer toner to them in the manufacture of printed circuit boards. Two tweezers will also be needed, one can be. Then the board must be held carefully with your hand. You can also hold the board with pliers, in extreme cases, with pliers. The aluminum base is heated during the brazing process. To speed up the soldering process, you need a flux. I am using Chinese RMA-223. You can also take the usual alcohol-rosin type F3.
How to solder LEDs with an iron

We fix the iron in an inverted position. I have a piece of paper cylinder. Can be clamped with clamps. The main thing is to eliminate the fall of a hot iron. I put on maximum power and set aside to heat up.
How to solder LEDs with an iron

While the iron is heating up. We check the LEDs with a multimeter. We put on the limit of measurement of diodes. We put the probes on the LED. The working LED is slightly highlighted.
How to solder LEDs with an iron

This is how the backlight of a working LED looks in the dark.
How to solder LEDs with an iron

We coat with flux and put the ruler on a heated iron. The area with the LED is lightly pressed for best heating. With tweezers, gently move our fireman and remove from the board. My heating time was about 10-15 seconds.
How to solder LEDs with an iron

The place where the burned LED stood, is cleaned and coated with flux.
How to solder LEDs with an iron

I used a donor board with similar LEDs. We solder it in a similar way (flux, iron, and so on).
How to solder LEDs with an iron

We put the worker in place of the burnt LED, according to the polarity. It's hard to mix up. One patch is bigger than another. We install on the iron and warm it up by pressing the LED with tweezers. After sealing, set aside to cool.
How to solder LEDs with an iron

After cooling the tape, we remove the traces of flux. I use isopropanol (isopropyl alcohol), you can use ordinary alcohol.
How to solder LEDs with an iron

We check. We connect power to the segment. My line has 44 LEDs. 11 LEDs are sealed in series, there are four segments. Each segment is connected to the others in parallel. I powered with a low voltage of 33.5 volts. Everything works great.
How to solder LEDs with an iron

This is how easy it is to solder the LEDs. Not having a blow dryer, but having a regular household iron.

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Comments (4)
  1. Alexander
    #1 Alexander Guests March 11, 2019 16:38
    1
    about tester calls, the advice is not entirely correct. LEDs are now at different operating voltages. I came across 3030 at 35 volts. It is easier to alternately “shorten” the resistor.
    And the iron is a long-known "soldering station."
    1. popvovka
      #2 popvovka Visitors March 12, 2019 08:03
      0
      I searched. Found only 6 volts. This is the case with two in one case in series. What is the working current? How many are installed? How are they then installed in a car?
      Using the example of the LEDs in the article, everyone calls the tester.
    2. Sergey K
      #3 Sergey K Visitors March 15, 2019 00:30
      0
      I confirm. In one burned out lamp, I could not light a single LED with a 25 volt power supply. In the second, there was a slight glow. So the repair makes sense if there are a lot of lamps and they are of the same type, one immediately to the donors and then repair the rest.
  2. Semen
    #4 Semen Guests March 13, 2019 07:05 AM
    1
    By the way, diodes come in different polarity and a large patch can be either an anode or a cathode.

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