Why is it so difficult to build an outdoor LED screen in Lanping? I met a restaurant owner two days ago. The screen he bought for 80,000 yuan turned yellow after three months of use. The maintenance man shook his head when he saw it - the lamp beads were not sealed at all. Today we are going to talk a little more down to earth and teach you how to avoid these traps and choose hard goods that can withstand the torment of the plateau climate.

1. First understand these hard indicators

In Lanping, the humidity can reach 80% in the rainy season, and it can even reach minus 5 degrees Celsius in winter. One thing to pick on the screen——​ ​The waterproof level must start at IP65​ ​. I had a water inlet screen dismantled last month, and fish could be raised inside. The repair cost was enough to buy half a new screen.

The matter of brightness is even more serious.​ ​Don’t believe those with false claims of 4000cd/m²​ ​. Let me teach you a simple trick: at 12 noon, use the mobile phone’s photometric software to take a picture at the screen. If the value is lower than 3500, pass it directly. The most deceptive business I have ever seen, the nominal price is 5000cd/m², but the actual price is only 2800, as if it is covered with a veil.

The pixel pitch depends on the actual viewing distance. Give a chestnut:

• Advertising screens viewed across the road: Choose P6-P8
• Store entrance display screen: P4-P6
• Square stage: P10-P16
  Last year, a supermarket bought a P10 screen for a cheap price and used it as a front door. When I got closer, it was all mosaic, just like a mosaic advertisement.

2. You need to know these three tricks to find a manufacturer.

I have been in the industry for seven or eight years, and I have come up with a method of "seeing, hearing, asking, and knowing":

​​see​ ​: Let the salesman unbox and look at the internal structure. On the back of the modules from serious manufacturers, the cables are neatly arranged in a serpentine shape. I've seen some brand-name products with cables that look like spider webs. This kind of screen is bound to break down after half a year of use.

​​smell​ ​: After powering on, get closer and smell it. A good screen only has a faint plastic smell. If you smell a pungent burnt smell, run away - it is definitely made of recycled materials.

​​ask​ ​: Ask directly "Whose lamp beads are they belong to?" Although merchants may not necessarily tell the truth, those who dare to report legitimate brands (such as a certain Taiwanese chip) are at least confident. If you come across something that hesitantly talks about "self-packaging", chances are it's a second-hand refurbished product.

3. The twists and turns in price

Don’t be fooled by the low price! Last year, I helped a customer inspect a batch of goods, and the quoted price was 30% lower than the market price. The result:

• The power module is a copycat OEM.
• The driver IC is a disassembled part
• Welding joints can be seen with the naked eye.

Teach you how to calculate accounts:
A genuine P6 outdoor screen costs about 3,800-4,500 yuan per square meter. If the price quoted is less than 3,500, you are either cutting corners or preparing to run away. in particular​ ​Aluminum magnesium zinc alloy box​ ​, the material cost alone accounts for 30%, and those selling for more than 2,000 are definitely problematic.

4. The crucial details of installation

Even if you buy a good screen, it will still be useless if it is not installed well. Last year, a large screen in a gym was blown over by strong winds, and it was found that four expansion screws were missing. Be sure to avoid these minefields:

1. ​​The foundation depth is less than 1 meter​ ​: In Lanping, a place with strong winds, the foundation must be laid at a depth of 1.2 meters.
2. ​​Steel structure painting instead of hot dip galvanizing​ ​: Rust is guaranteed to wear out in three years. You must choose a galvanized layer of 280g/㎡ or above.
3. ​​Provincial lightning protection and grounding​ ​: Repairing a screen that has been struck by lightning is more expensive than buying a new one.

It is recommended to keep an eye on the construction team and do three things:

• Use a megger to measure the ground resistance (should be <4Ω)
• Use a torque wrench to tighten the screws (don’t trust hand tightening)
• Complete the 48-hour aging test (color unevenness can be found at this time)

5. After-sales is the highlight

Let me tell you something from the bottom of my heart: It is easy to buy a screen but difficult to maintain it. Worst after-sales service I’ve ever seen——

• No one responded to the repair report for three days
• There is a "remote area service fee" for door-to-door visits"
• Wait two months to replace the module

Before signing a contract, be sure to confirm:

1. Within the warranty period​ ​Free door-to-door service​ ​(Do not accept sending for repair)
2. The spare parts warehouse has​ ​Same model module​ ​(Can be replaced on site)
3. 7×24-hour technical response (a black screen in the middle of the night can save lives)

Editor's opinion: When buying outdoor LED screens in Lanping, you have to find a manufacturer that dares to show you the workshop, show you test reports, and share local cases. Don't look at those fancy advertising slogans, but the five-year warranty is better than anything else. After all, our money didn't come from the strong wind, right?

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