1. Hey, why is the lamp bead model so important?

Do you know? Last year, a friend bought a second-hand LED screen, but it turned out that the screen flashed wildly after half a year of use. The maintenance master took it apart and shook his head: "Your lamp bead model is too old, and the accessories are now discontinued! " So,​ ​The lamp bead model is like the ID card of the display screen​​, you have to rely on it for optional accessories, repairs, upgrades and renovations.

​​Give a real example​​: A curved advertising screen project in Singapore, because the lamp bead model was recorded in advance, the cost of later maintenance was directly reduced by 40%. On the contrary, some users simply buy screens without recording the model. If they change the lamp bead, they have to replace the entire module. Do you think they will lose money?

2. Don’t panic! 3 places to easily find models

​​Q: I am not a technician, where can I find these alphanumeric combinations? ​ ​

1. ​​The most intuitive product label​​
   Generally, there is a silver label with a QR code on the back or side of the display screen. Focus on the code starting with "SMD", for example​ ​SMD2121​​This format. Some manufacturers will write "LED Chip Type" and follow the model.
   Tips: Can't see clearly when you encounter reflection? Use a tissue to dip it in some water to wipe the edges of the label, and 80% of the cases can be revealed.

2. ​​Control system check parameters​​
   Go to the "Device Information" menu in the control software and turn to the "Hardware Configuration" page. You can see not only the model, but also the​ ​Batch number and production date​​. For example, I helped a bar check the fault last year and found that their screens were made of lamp beads from 5 years ago. No wonder the color was not as bright as the new screens.

3. ​​Disassemble the module to see the real thing​​
   What if the label is worn? Carefully unscrew the 4 screws on the back and remove the lamp board. The surface of the lamp bead is laser engraved with a miniature model. You have to use the macro mode of the mobile phone to zoom in to 200% before you can see clearly.
   ​​Notice​​: Disassembly is risky! Novice recommends that you practice first when looking for a waste screen, and don’t break the good screen.

3. The alphanumerical numbers in the model are hidden secrets

​​Q: What is the difference between SMD2121 and SMD2727? Is the bigger the number, the better? ​ ​
Here is a password rule that everyone knows in the industry:

• The first two digits represent the length of the lamp bead, such as 21, it is 2.1mm
• The last two digits are width, 21 is 2.1mm
• The letter suffix indicates a special process, such as "D" is an anti-static model.

​​Comparison table​​：

Last time I saw a gymnasium using the fenced screen of SMD2727, and I could still see clearly under the sun. The case of using the wrong model is even more scary - a shopping mall installed an indoor model outdoors, but 30% of the lamp beads were broken before the rainy season passed.

4. Don’t step on these pitfalls!

​​Q: Some people on the Internet say that you can guess the model by looking at the color. Is it reliable? ​ ​
Don't believe it! Now the lamp bead packaging technology is too advanced, and the same model can produce more than 20 colors. I once saw with my own eyes that both screens use SMD2121, one is cooler and whiter and the other is warmer and yellow, with a color temperature difference of 300K.

​​Common misunderstandings for beginners​​：

1. I think all 2121 can be used → In fact, there are two circuits: common yin/common yang
2. Only look at the size regardless of wavelength → Mixing different batches of lamp beads will lead to color blocks
3. Ignore the protection level → Use ordinary models for outdoor screens, and waterproof glue cannot be saved

5. What should I do if I can’t find the model?

Don’t seek medical treatment at this time! Teach you three emergency measures:

1. ​​Measure size​​: Use a vernier caliper to measure the length and width of the lamp beads, and the error is controlled within 0.1mm
2. ​​Photo spectrum​​: Use a spectrometer to measure the main wavelength when looking for a repair point, for example, red is generally between 620-630nm
3. ​​Check the driver​​: Record the control card model and power supply voltage, reverse derivation of compatible models

Last month I met an anxious customer, the display control card burned and the model label was blurred. We used the replacement parts to measure the size of the lamp beads + spectral analysis in 48 hours. So,​ ​Choosing a reliable manufacturer is more important than anything else​​, I have a complete set of parameter libraries in my hands, which can help me at critical moments!

​​Personal opinion​​: Now some manufacturers deliberately do not define clear models, so they want users to rely on their after-sales service. If I ask me, when buying a screen, you must write the parameters of the lamp beads in black and white. It is best to ask the manufacturer to provide a traceable batch number within 3 years. After all, no one wants to become a "display orphan" in five years, right?

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