Alas, a little brother who runs an Internet cafe recently asked me: "I want to assemble an LED screen by myself, where should I buy the materials? "This made me ask - now even the post-00s generation start playing with DIY displays? But then again, the water in this industry is really not that deep, so let’s talk about it carefully today.

Three most easy pitfalls for beginners to step on

1. ​​The lamp beads are inferior​ ​: It is marked with imported light beads, but it is actually a refurbished product. It will lose color after half a year of use.
2. ​​Power supply cut corners​ ​: A module bought by a milk tea shop, the power supply burned from 30% to 30% during the rainy season
3. ​​No matching package​ ​: The difference in size between the heat dissipation aluminum and PCB board is 1mm, and it will be deformed directly after installation.

There was a tragic case last month: the owner of an e-sports hotel was greedy for cheap online shopping materials, but the installed screen was severely color-shifted when playing HDR videos. Finally, the whole set was disassembled and remade, and the material fee was directly wasted.

How to choose core materials

Remember these sets of gold parameters:

• ​​Lamp bead brand​ ​: You need to look at the original anti-counterfeiting code, don’t believe the so-called “Taiwanese model”"
• ​​Driver IC​ ​: The refresh rate ≥1920Hz is the bottom line, and you can tell if you take a slow motion of the phone and you can tell if you are real or fake.
• ​​PCB thickness​ ​: 1.6mm is the basic model, 2.0mm thickened version must be selected for high-frequency use scenarios

The key point is here——​ ​See if the supplier dares to give a five-year light and decay report​ ​. There is a material manufacturer that supplies Japanese convenience stores. The lamp bead aging test requires a continuous roasting machine for 2,000 hours, which is the real material.

Procurement channels are of particular importance

There are many ways to buy materials now:

1. ​​Direct purchase by manufacturer​ ​: Suitable for bulk purchase, remember to request a customs declaration form for raw materials
2. ​​Professional Market​ ​: Distribution centers like Shenzhen Huaqiangbei can inspect goods on-site but test their eyesight
3. ​​E-commerce platform​ ​: It is recommended to choose a third-party inspection, and the grayscale level will be measured first when the goods arrive.

Special reminder: If you encounter "the lowest price on the entire network", you will be more careful. An Internet cafe owner has bought a power supply that is known as the lowest price in the industry. When you disassemble it, you can see that the capacitor is one-third less. This kind of pit can be remembered for a lifetime after you step on it.

Prices are squeezed and watery

Take 1 square meter P3 screen material as an example:

• Low-end version: 800-1200 yuan (the yield of lamp beads ≤97%)
• Practical model: RMB 1500-1800 (with temperature control chip and moisture-proof coating)
• Military grade: 2500 yuan + (IP65 protection + aviation aluminum structure)

Focus on​ ​Number of lamp beads per square meter​ ​! P3 screens normally require 1111111 pieces/㎡. Some merchants cut corners to achieve 100,000 pieces, and the price difference can make a huge profit of 30%. I will teach you a trick: use a vernier caliper to measure the spacing between the lamp beads, and the error exceeds 0.01mm will be returned directly.

After-sales service is the touchstone

Reliable suppliers have these characteristics:

• supply​ ​Light fade compensation scheme​ ​: Free replacement for color decline in three years
• ​​Technical guidance group​ ​: Answer questions online 24 hours a day, even the screw torque value is in charge
• ​​Material Traceability System​ ​: Each lamp bead can find production batches

I heard that there is a material manufacturer that supplies Korean e-sports halls. The driver board sold three years ago can also upgrade firmware for free, which makes people feel at ease.

The editor says something real

Next time you go shopping in the mall, remember to touch the radiator temperature of the LED screen. If the temperature is even, the materials are well matched. If you see a display screen that has not been changed for three consecutive years, just contact the operator to inquire about the source of the materials. Now smart people have found channels to supply goods to overseas projects. They can even pass the salt spray test during the rainy season in Singapore, and the quality is absolutely hard-core. By the way, remember to​ ​Lamp beads spectroscopic color separation report​ ​, do not charge if the color coordinate deviation exceeds 0.003!

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