Can’t find the model label on the newly unpacked LED screen? Last month, a customer was so anxious that the large outdoor screen he bought needed to be repaired. As a result, he rummaged through the box and couldn't find the model number. In the end, he had to dismantle the entire module and send it back to the manufacturer. This is not an isolated case, industry reports show​ ​32% of after-sales disputes stem from missing model information​ ​. Today I will take you to play a "model treasure hunt game" and teach you step by step how to find the ID card on the LED screen.

Three hiding spots for physical tags

​​First stop: the back of the module​​
More than 90% of LED screens will have a label on the metal back of the module, just like the network access permission on the back of a mobile phone. When a curved advertising screen was installed in a shopping mall in Shenzhen last year, workers found the P4 model mark in the lower right corner of the module. Pay attention to see if there is this format: P+number-XXXX-XXXX, such as P3-6464-2121-32S-V28. This string of passwords hides key information such as dot spacing and lamp bead type.

​​Second stop: box joints​​
The aluminum-magnesium-zinc box commonly used for rental screens has a model label often embedded inside the splicing buckle. Here’s a trick: Use your mobile phone’s flashlight to illuminate the seam diagonally. The reflective sticker will most likely be the model label. I remember that in a stadium project, engineers found the IP65 protection grade mark on the edge of the heat dissipation hole on the side of the box.

​​Third stop: power module​​
There is often an "ID card" attached to the heat sink of the control card. Last month, a restaurant owner found the model code of NS-AD-7500 next to the power interface. NS represents the brand series, AD refers to the outdoor advertising screen, and 7500 is the brightness value. This also explains why his screen can clearly display the menu at noon.

A guide to deciphering technical specifications

​​Refresh rate ≥1920Hz​ ​This parameter can be directly detected using the mobile phone camera. Turn on the recording mode and aim at the screen. If there are no black scanning lines on the screen, it means the standard is met. The stage screen at last year's Spring Festival Gala was inspected in this way, so photographers no longer have to worry about screen breaks.

​​Smart brightness adjustment​ ​Functionality depends on environmental adaptability. Let me teach you a simple trick: shine a flashlight on the light sensor of the screen to see if the brightness will automatically increase. This is how the guide screen of a certain subway station passed the acceptance test. The brightness difference between morning and late night can be more than three times.

Hidden level for manufacturer contact

If the label is worn, quickly take three photos: the overall front, a close-up of the back of the module, and the details of the power interface. Send it to the manufacturer's technical support center, and they can infer the model number based on the pixel arrangement and packaging process. A batch of fence screens exported to Japan last year were confirmed to be NS-SP series based on the diamond-shaped arrangement of the lamp beads.

Experienced engineers will also ask you for the control card number. For encoding like NS-CC-2025, CC stands for common cathode driver, and 2025 means that it supports 2025 * 2025 resolution. remember,​ ​Technical team that can respond 24 hours a day​ ​, often you can report a full set of parameters just by looking at the photo of the control card.

Model metaphysics cold knowledge

The smaller the dot spacing is, the better. The P2.5 poster screen used in convenience stores is sufficient, but installing P1.5 is a waste. But if it is a window display in a luxury store, P0.9 can show the delicate luster of jewelry. It’s like dressing up, can daily commuting be the same as walking on the red carpet?

Recently I discovered a phenomenon: the screen model labels exported to Japan and South Korea are all trilingual in Chinese, English and Japanese, while the Southeast Asian version will have an extra line in Thai or Vietnamese. Therefore, label language can also help determine the flow of products. For those second-hand screens with "original foreign trade order", you can tell whether they are from the right place or not by looking at the label language.

Editor's point of view: Finding the model is like solving a crime. The label is the bright line and the parameters are the hidden line. Next time you see a salesperson who boasts "invincible parameters", just ask him to take a photo of the model label to ensure you can test out the depth. Remember, the quality of manufacturers that dare to print their model numbers generously is usually not that bad.

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