Dear bosses, please pay attention! Recently, many friends asked me: "If you want to get a second-hand LED screen, where should you buy it to be reliable?" To be honest, this industry is indeed deep, but don't panic! Today we will talk about it and teach you how to find good products with the minimum amount of money.

1. Five golden channels for second-hand LED screens

​Let’s talk about the first channel first——Online second-hand platform. APPs like Xianyu and Zhuanzhuan have now become gold mining sites. Last year, more than 3,000 second-hand screens were sold in Shenzhen alone. But be careful! There are mixed things here. Last week, my buddy met a strange seller. He had agreed to have a full color P3 screen. He found it was a refurbished P4 screen. He was so angry that he stomped his feet.

​​The second type of reliable channel​is a professional recycling company. Some companies specialize in electronic equipment recycling, such as a recycling resource company in Shenzhen that processes more than 200 LED screens per month. These companies will grade the recycled screens: Class A cargo powered on 72 hours, Class B cargo dismantling parts sold, and Class C directly dismantling and recycling metal. It is recommended to choose merchants that provide a 3-month warranty first.

​The third hidden channel​It is an industry exhibition. Every year, there is a second-hand equipment trading area at the LED exhibition in Guangzhou. Last year, there was a P2.5 screen for rental, and the equipment with an original price of 180,000 yuan was sold for 50,000 yuan in two years. Let me add a sentence here: Most of the equipment at the exhibition is eliminated by rental companies. Although the appearance is worn, the core components are in good condition.

2. Three must-see test tips for beginners

Don’t rush to pay when you encounter a second-hand screen! Remember this mantra: "One look, two, three, and three." When I was inspecting the customer last week, I found that the power module of the screen was replaced with a miscellaneous brand, which is a fatal problem.

1. ​Appearance inspectionDon't be lazy:
   Focus on whether there are bumps in the four corners (transportation is the most likely to be damaged here). If the module splicing seam exceeds 1mm, don’t worry. Once I saw a block screen. It looked fresh from a distance, but when I saw close, I found that the surface of the lamp beads was full of scratches - this is obviously an outdoor screen that has been used in the open air for more than three years.

2. ​Performance Test​To complete set:
   The seller must be given a live demonstration:

   • White balance test (see if there are any stains)
   • Grayscale transition (better than 16th level must be clear)
   • Maintain maximum brightness for 30 minutes (prevent false marks)
     Last year, there was a screen with a nominal 4500cd/m², and the actual test was only 3800. This kind of product must not be accepted.

3. ​Disassemble the core inspectionThe most important thing:
   Focus on the driver IC and lamp bead brands. For example, a certain brand of common driver IC has a service life of 3 years longer than that of ordinary goods. If you encounter direct passes with oxidation and blackening of solder joints, problems will occur in less than half a year.

3. The ultimate trick to prevent fraud with deep prices

Nowadays, it is very common for random quotes in the second-hand market to be! Last month, some merchants used the 2018 P4 screen as a sale in 2023, with a total price difference of 20,000 yuan. I will teach you a killer weapon - depreciation calculation formula:

​​Reasonable price = new product price × (1-year of use × 15%) ± maintenance cost ​​

For example, the new P3 screen product launched in 2023 is priced at 80,000 yuan, and the reasonable price after 2 years is 80,000 × (1-2×15%) = 56,000 yuan. If you change the 20% lamp beads, you will have to reduce another 5,000 yuan.

Special reminder: When encountering these two situations, run away!
① Refused to provide factory inspection reports
② It is said that it is the project final product but cannot find the project case

4. Don't step on these minefields

1. ​​Refurbished screen trap​: Some businesses change the outdoor screen to a shell and sell it as an indoor screen, and the cooling structure of this screen does not meet the requirements at all. Last year, a training institution bought a "conference room dedicated screen" and it appeared after using it for two months.
2. ​​Severely affected area of ​​parameter fraud​​：
   • Refresh rate: Use 1920Hz to impersonate 3840Hz
   • Protection level: outdoor screen IP65 to IP54
   • Power consumption: Actual electricity consumption is 30% higher than nominal
3. ​​Dark disease detection skills​：
   Prepare an infrared thermometer and scan the screen under the full white screen. There must be problems in areas with temperature difference exceeding 15℃.

Personal opinion time

After playing with LED screens for more than ten years, I think what the second-hand market lacks most is not good goods, but a transparent trading environment. Now some recyclers collect screens as cabbages and sell them as antiques, and this business cannot last long. It is recommended that novices give priority to equipment with original factory service records. Although it is 3,000 or 5,000 yuan, it can save 20,000 to 30,000 yuan in subsequent maintenance.

The last nagging sentence: Don’t be greedy for cheap goods! Last month, a customer spent 30,000 yuan to buy a batch of "customs fined confiscations", but found that it was an OEM product from a copycat workshop, and there was no place to protect their rights. Remember, good goods may not be cheap, but those that are too cheap will definitely not be good!

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