When you stand in a shopping mall and see those cool big screens, are you curious about where you bought these full-color LED display screens? Don’t rush to open the shopping app search, let me tell you a real story first – last year, a milk tea chain store bought a display screen online, but on the day it opened, there were color blocks on the screen, making customers think they were holding an abstract art exhibition. Today we will talk about this annoying purchasing issue.

▎The first lesson when buying a screen: Understand the industry’s slang"
Don’t be fooled by the salesman’s talk of P3, SMD, and refresh rate. Simply put:

• ​​Pixel pitch​ ​: The smaller the number, the more delicate the picture (for example, P2.5 is more than twice as expensive as P10)
• ​​refresh rate​ ​: 1920Hz or above will not hurt your eyes, especially when using screens in restaurants, you should pay attention to this
• ​​Brightness adaptive​ ​: Outdoor screens don’t have this function and can’t be seen clearly on a sunny day.

Here’s a little trivia: In fact, 75% of the LED screens currently on the market labeled “4K” do not meet the true 4K standard. Let me teach you how to identify it - look closely to see if there are mosaic-like particles. In true 4K, you can't see pixels at all from 2 meters away.

▎The "Red and Black List" of Purchasing Channels"
• ​​Three major pitfalls of online purchasing​​：

1. Parameter virtual scale (the actual measured brightness may be discounted by 30%)
2. Post-sales evasion (there has been a strange operation where the seller asked the customer to dry the screen by himself)
3. Incompatible accessories (control card and power supply may be from different foundries)

• ​​Offline purchasing tips​​：

1. Ask for live video playback (don’t believe the static samples they prepare)
2. Touch the temperature of the heat sink (don’t use it if it’s still hot after half an hour of power on)
3. Check the workmanship of the interface (pass if it is rusty or loose)

Last year, a gym owner suffered a loss from online purchases. The screen he bought showed color differences after three months. Later, he found out that different batches of lamp beads were mixed. Remember, the batch difference of good LED screen lamp beads should be controlled within ±3%.

▎The "Three Looks" Principle Behind the Price Fog"
​​Take a look at the installation environment​​：

• A P6 screen is enough for the checkout counter of a milk tea shop (about 12,000 per square meter)
• The atrium of the shopping mall requires at least P4 (starting at 28,000 per square meter)
• Don’t save money on protection for outdoor advertising screens (IP65 is the bottom line)

​​Second, look at the frequency of use​​：
If the screen is on for more than 12 hours a day, the power module must be military-grade. There is a case of a car 4S shop. They chose a standard power supply in order to be cheap. As a result, the control card burned out in half a year, and the maintenance fee was more than the original money saved.

​​Third, look at maintenance costs​​：
Don't believe the "five-year maintenance-free" nonsense! A truly reliable solution should include:
• Remote troubleshooting
• Spare parts warehouse real-time response
• Regular dust removal service

▎Self-question and answer session
Q: Can I buy it online at half the price than offline?
A: Let me tell you an industry insider - some ultra-low-price screens use refurbished lamp beads, and the color of such screens will fade after half a year. Let me teach you a detection method: use a pure white screen to display in full screen. The yellowed screen is the problem screen.

Q: How to judge whether the manufacturer is a leather bag company?
A: If you want the other party to send you a live video of the workshop, please pay attention to three points:

1. Is there an automated placement machine?
2. Does the quality inspection station have a spectrum analyzer?
3. Are spare parts stored in categories in the warehouse?

Q: Is overseas purchasing reliable?
A: Unless you are willing to wait three months for customs clearance, you will still have to bear 20% tariff. Nowadays, the technology of major domestic manufacturers has already surpassed it. 87% of the LED screens in the Southeast Asian market are made in China. You can check this data.

Finally, I would like to say something from my heart: Buying an LED full-color screen is like looking for a marriage partner. Just looking at appearance (display effect) is not enough. You also have to look at family background (technical strength) and sense of responsibility (after-sales service). Those manufacturers that dare to provide 7×24-hour technical support at least mean that they have a complete operation and maintenance system. Next time you go to visit a store, you may want to pay attention. Those businesses with stable images and no flickering are definitely using products from professional manufacturers.

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