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How to judge the quality of a light-emitting diode?

Date:

2024-03-11


I often see a lot of comments in the background, how to judge the quality of LED lamp beads? Why? Because many people don't know how to judge the quality of LED lamp beads. How to judge the quality of LED lamp beads? What we use more often is the multimeter measurement method. How to use a multimeter to judge the quality of LED lamp beads. You can read Professor Lamp Bead’s previous article: How to measure the quality of light-emitting diodes? How to measure the quality of SMD LEDs? It introduces two methods on how to judge the quality of LED lamp beads: 1. Use the red test lead of a multimeter to contact the positive electrode of the LED, and the black test lead to the negative electrode of the LED.
Use a multimeter. Before measuring, set the multimeter to the diode position (the beeping position), and then touch the multimeter probes to the metal on the left and right sides of each lamp bead one by one. If the multimeter does not make a beep when making contact, It means that the lamp bead is broken.

                                   

2. Use the LED test pen to test the quality. The specific test method is the same as above. And today, we also tell you a simple method to judge the quality of LED lamp beads? How does this method work?

1. Connect two AA batteries in series.


2. Weld two hard wires to the positive and negative terminals of the battery on the top.


3. Connect the positive and negative poles of the lamp bead with hard wires welded to the positive and negative ends of the battery.


4. After the positive and negative poles are connected, the lamp bead can light up, indicating that the lamp bead is good.


5. If the lamp bead does not light up, it means that the lamp bead is broken. What should I do if it breaks? If the lamp beads are connected in series throughout the circuit, you can directly connect the positive and negative poles of the lamp beads without affecting the use.


Look, after this test, it’s super simple. This is like a simple physics classroom experiment. Some students asked, what should I do if I don’t know how to weld the positive and negative electrodes? We can use some tools around us. For example, find a TV remote control. (Air conditioning is also available)


The next step is to find a short power cord and connect it simply as shown in the picture.

Next, use these two power cords directly using step 3.4.5 above. If multiple lamp beads are broken, please repeat the previous steps 1, 2, 3, 4, and 5. Finally, find out the bad lamp beads and replace or short-circuit them to solve the problem of the lamp not lighting up or dimming. The quality of the LED lamp beads can be found out. From discovering that the LED lamp bead is broken to using commonly used simple tools to solve the lamp bead problem, using the above small methods is very practical and simple, but it can solve common problems in our lives. You can try it...

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