"I can't find a reliable LED screen even if I run around the building materials market? Don't you be fooled by others!" Boss Zhang, who just opened a hot pot restaurant, squatted on the side of the road and sucked a cigarette butt. Don’t laugh, everyone, it’s harder to find a reliable LED display these days than finding a partner! Today we will break it apart and talk about where to change this thing.

▎First understand: What kind of display do you want?

​3 seconds self-test method​: Take out your phone and take a picture of the installation location-

• If it is installed at the door of the hot pot restaurant, you have to choose​Outdoor screen​(Brightness ≥5000cd/m², waterproof and oil-proof)
• If it is installed in the shopping mall window,Transparent screen​Most suitable (86% permeability does not affect display)
• If you have a concert,​Lease screen​It's the kingly way (quickly disassemble and assembly, no matter how bad it is)

Guess what? Last year, the fenced screen in Tokyo Stadium was specially customized IP65 protection level, and it was still as stable as an old dog on heavy rains. So,​First to figure out the usage scenario, it is more important than anything else​​。

▎Comparison of the three major channels for finding goods

For example, a shopping mall in Bangkok purchased transparent screens across the border last year. However, when customs clearance was cleared, it was found that the CE certification expired, and the late payment fee alone was compensated 80,000 baht. So,​Novices still recommend local examples + direct signing from manufacturers​The safest.

▎Five-step life-saving method

1. ​Touch the temperature​: After half an hour of starting the module, pass directly after exceeding 45℃
2. ​​Measure grayscale​: Let the manufacturer draw out a 256-level grayscale diagram, if there is a fault, it is a low-end product
3. ​Check the interface​: At least 2 HDMI/USB interfaces are available, so you can catch them later if you don’t have any problems.
4. ​To report​: The 48-hour high temperature and high humidity test record must be viewed from the original
5. ​Try splicing​: Randomly drawn 3 pieces of module assembly, sewing exceeds 0.5mm is considered unqualified

Last year, a coffee shop in Seoul suffered a big loss - only the middle area was measured during acceptance, but the brightness of the edge and corner module was 30%, which looked like it was patched at night.

▎How deep is the price water?

Don’t listen to sales fooling you with “imported chips”. I’ll teach you three tips for bargaining:

1. ​Order at the end of the month​: Sales can cut 5%-8% more to achieve performance
2. ​Package purchase​: Discuss the display screen + control system + installation together, saving 10% service fee
3. ​​Demand period​: 30-day account period ≈ 3% off the price reduction in disguise

But to be honest, the prices of regular manufacturers are transparent now, and the P4 outdoor screen is basically​2800-3200 yuan/㎡​Float. If the quotation is less than 2,500, 80% of it is a second-hand refurbished product.

▎Installation acceptance pit avoidance guide

Don't be the boss! These three nodes must be watched:

1. ​​When laying the foundation​: Is the concrete curing not enough for 28 days? Call to stop quickly!
2. ​When routing​: The power cord is not covered with flame retardant pipe? Rework!
3. ​​Default​: The brightness of the night mode is not adjusted? Reset!

We suffered a loss when installing the curved screen in Singapore - no maintenance port was reserved during installation, and later, half of the wall had to be removed when changing the power supply, and the labor cost was 20 times more expensive than the parts.

▎Potential rules for after-sales maintenance

Remember these three life-saving calls:

1. ​​400 Technology Hotline​​: The crash/black screen is called first (someone answers 24 hours a day)
2. ​Area Manager Mobile Phone​: Just contact him for spare parts dispatching
3. ​​Electronic Lao Wang number​: Make simple faults yourself (such as cleaning/tightening screws)

The most tricky thing is that some merchants sell the screen to customers and ignore it. As a result, the control card is damp during the rainy season, and the maintenance fee alone is enough to buy half a new screen. So,​Choose a manufacturer and see if there is a 24-hour response​​, this is particularly critical.

Editor's opinion

After working in the project for more than ten years, I discovered an interesting phenomenon:​Manufacturers who dare to provide 7-day unreasonable tests have generally lower failure rates by 30%​​. For example, when we install screens for Southeast Asian customers, we will test the sample machine for three months first, and we will sign a large order after passing the test. Next time you are looking for a supplier, you might as well ask directly: "Can you try a prototype first?" Those who dare to agree are 80% powerful people, and those who are hesitant should block them as soon as possible!

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