Have you ever encountered this situation? Last year, my cousin opened a supermarket and bought an LED screen in the second-hand market for cheap photos. As a result, the color block fault occurred after three months of use. Later, it was found that it was the inventory in 2015! Today we will talk about where ordinary people should find reliable LED electronic screens.

Comparison of five mainstream channels

First pour cold water: The 2023 industry survey shows that 34% of buyers encounter quality problems within three months of purchasing. The key point is here, you have to read these channels carefully:

​​▎Offline physical stores​​
Advantages: Can see the effect on the spot and get the heat dissipation hole
Disadvantages: Incomplete models, the price increase rate is generally between 20% and 35%.
Suitable for: small shops that are eager to use screens

​​▎Direct sales of industrial belts​​
For example, a certain LED industry cluster in Shenzhen (60% of the screens in the country are leaking from here)
Advantages: Price 15%-20% lower than market price
Points: I have to do the logistics installation by myself, and a buyer once received a broken screen

​​▎E-commerce platform​​
• A cat flagship store: authentic but expensive, suitable for buying small-sized poster screens
• Moduoduo: Price butcher, but the proportion of refurbished machines is as high as 28% (industry undercover data)
• Live broadcast room to sell goods: be careful of the so-called "factory price", many of which are low-bright screens that impersonate high-brightness

​​▎Project provider​​
If you do a large project like stadium fence screen, it is more worry-free to find a qualified engineer directly
Key points: They must check their "Electronic Engineering Construction Qualification Certificate"

​​▎Overseas purchasing agent​​
Don't laugh! Someone really purchased a transparent screen from South Korea, but the voltage did not match and the controller burned
Important tip: The domestic standard is 220V±10%, and Japan and South Korea are 110V

Guide to avoid pits when selecting parameters

I heard from engineers at the industry exhibition,​​Seventy percent of buyers can't understand the parameter list at all​​. You have to circle these indicators with a red pen:

​​Refresh rate​​：
• Screens below 1920Hz will have water ripples when shooting videos
• Test method: Turn on the camera mode of your phone and slowly move towards the screen

​​Brightness adjustment​​：
• It is recommended to choose 800-1200cd/m² adjustable indoor screen, don’t believe those with nominal 5000cd
• There is a case: A shopping mall bought a high-bright screen and was complained of light pollution at night and lost 20,000 yuan.

​​Protection level​​：
• The outdoor screen must be IP65 at least (dust-proof and waterproof)
• Test soil method: After packing, water with a flower pot for 2 minutes

Price difference mystery

Why do some P4 screens of the same size report 20,000 or 8,000? Take apart and see the tricks:

• ​​Lamp bead brand​​: Imported lamp beads are three times more expensive than domestic ones
• ​​Power supply module​​: The failure rate of miscellaneous power supplies is 5 times that of branded parts
• ​​Control system​​: Copy control card may cause 15% color difference

There is a key point here: the supplier is required to provide a "Component List Details", preferably specific to the model of the driver IC. The dance floor tiled screen bought by a gym last year was repaired six times in three months because it used a low-quality IC.

Self-question: A must-see for novice

​​Q: How to inspect the goods when buying a screen online? ​ ​
Let the seller release the boot video first, and focus on whether there are any viscera in the four corners. Don’t rush to sign for the goods when receiving them. Power on and test 8 solid colors - last year, a buyer received a green defective screen in the lower right corner.

​​Q: Can you buy a second-hand screen? ​ ​
Depend on the use time: be cautious if you have more than 30,000 hours (the industry standard life is 60,000 hours). There is a detection technique: use grayscale to test the image, and the old screen will have obvious brightness attenuation.

​​Q: How long does it take to wait for a custom screen? ​ ​
Regular size 7-15 days, special shapes (such as curved advertising screens) take at least 45 days. If you are anxious to use it, please note: A customer's construction period caused the box to be not rust-proof, and the beach project was rusted in half a year.

After-sales secret battle

Don't make a verbal promise! It must be written in black and white:
• Compensation standard for dead light rate (industry is ≤0.01%)
• Door-to-door maintenance response time (liquidation penalty will be deducted if it exceeds 48 hours)
• Software upgrade service period (new format video may not be used if the system is not updated)

There is a tough trick: require suppliers to provide maintenance records for other customers. A chain of hotels used this trick to screen out three suppliers with poor service.

Editor's opinion

Now some manufacturers play word games, such as using "peak brightness" as normal brightness promotion. Let me teach you a tip: see if there is a "low brightness and high gray technology" written in the parameter table. This technology can keep the screen color accurate at low brightness - this is the ID card of a high-end screen!

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