Alas, have you ever encountered this situation? If you want to create a large LED screen to make a store sign or event layout, you can directly discourage the price of the brand new equipment - especially for friends who have just entered the industry, you may even have to solve the equipment problem "how newbies can quickly increase their fans". At this time, many people will think of the second-hand market, but to be honest, the water is too deep! Today we will talk about how ordinary people avoid pitfalls in the second-hand LED display market.

​​Let me tell you a few real cases​​: I know a guy who runs a milk tea shop. I spent 30,000 yuan to buy a second-hand outdoor screen, but after using it for a month, the color blocks broke down.； There is also a sister who is engaged in weddings. She received a purchase of second-hand rental screens at the cheapest photo, but one-third of the event was not lit... This is a lesson learned from blood and tears. So the question is​ ​Can you buy a second-hand LED display? Where to buy it is reliable? ​ ​

Let’s talk about common sources of supply for everyone first. Now the market is mainly divided into three categories: online platforms, internal industry circulation, and physical store inventory. Online platforms such as the ones, fish and transfers, are indeed attractive, but most of them are the ones who make a profit from the difference, and the equipment parameters depend on the seller's mouth. The circulation of second-hand equipment within the industry is relatively reliable, such as the rental screens eliminated by the event companies, but ordinary novices cannot find any way to such resources. The most reliable thing is to find physical service providers. Some manufacturers will handle the inventory of display machines or customer refunds. This kind of equipment usually has a complete inspection record, but the price will be about 15% higher than the second-hand price on the market.

Here is a hard-core knowledge point:​​Five parameters must be used to buy a second-hand LED screen​​. The first thing to see is the refresh rate. The indoor screen starts at least 1920Hz, otherwise the videos taken will be corrugated. ； Secondly, look at the brightness adjustment range. 800-1200 nits are enough for indoor use, and the outdoor screen is less than 4000 nits. ； Third, you must confirm the protection level. Do not touch outdoor screens without IP65 certification. ； Fourth, check the dead light rate, use solid color pictures to test, and give up if there are more than 5 bad points per square meter. ； Fifth, see if the control system is original. Many second-hand equipment has been modified, and later maintenance can kill you.

Someone may ask: "Is second-hand equipment really more cost-effective than brand new ones? ”This matter has to be settled. Suppose you want to buy a P3-specification indoor screen, the new price is about 8,000 yuan per square meter, and the second-hand one may be cut to 4,000 yuan. But don't be too happy too early! The transportation and installation fee of second-hand screens will be 20% more expensive than that of brand new equipment, because the aging structure has to be handled. ； The frequency of later maintenance will be three times higher than that of new equipment according to industry data. By doing this, unless you are sure that the equipment has been shipped out of the factory in the past two years and has low frequency of use, the money saved may not be enough to fill in the repair pit.

Speaking of this, I have to remind you a few​​Deadly minefields​​：

1. It is known as "90% new" but cannot provide factory numbers
2. There is rust on the box interface or severe wear of the screw holes
3. The driver power supply has been replaced with a miscellaneous brand
4. The seller refuses to sign a three-month warranty agreement
5. The pixel spacing parameters do not match the actual display effect

Especially in the last post, some unscrupulous merchants will sell P4 screens as P3s, and laymen can't see it at all. I will teach you a local method: take a video with your phone facing the screen. If there is a clear scan line, either the refresh rate is insufficient or the pixel density is imaginary.

The question comes again:​​How to judge the strength of second-hand equipment? ​ ​Focus on two parts - the power interface and the cable plug. For high-frequency equipment, there will be plugging and unplugging marks at the interface. If the metal contacts in the cable are oxidized and blackened, it means that they have experienced at least 200 disassembly and assembly. There is another tough trick, requiring sellers to provide the equipment's cumulative working hours. Now the mainstream control system can find this data, and those within 2,000 hours are considered lightly used.

Suddenly I thought of a key question:​​Can you buy a second-hand transparent LED screen? ​ ​Be especially careful about this. Transparent screens have extremely high requirements for packaging technology, and second-hand equipment is prone to local uneven light transmission. Last year, a customer spent 60,000 yuan to buy a second-hand transparent screen, but it seemed like a patch when it was not turned on during the day, and finally it could only be used as an ordinary screen. If you have to buy it, remember to bring a white acrylic board to test the light transmission consistency on site.

Finally, let me give you my personal opinion: it is not impossible to buy second-hand LED displays, but they are definitely a technical job. It is best for beginners to take a master who knows how to inspect the goods, focusing on checking the power module and control system version. If you really can't get it right, many manufacturers actually have old-for-new or financial installment policies, which may be more cost-effective than buying second-hand ones. After all, equipment stability is directly related to the reputation of the business. Do you think this is the reason?

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