1. What exactly does quality inspection check?

"What are the quality inspections for LED screens that are bought for a lot of money? "This problem is like buying a mobile phone to verify the machine.​ ​The core is to verify the three major abilities​​：

1. ​​Is the brightness hard enough?​ ​: The outdoor screen must withstand the noon sunlight, and the detection standard is ≥5000cd/m² (equivalent to 30 household light bulbs on at the same time)
2. ​​Is it waterproof, dustproof and resistant to manufacturing?​ ​: IP65 level protection must be washed with a high-pressure water gun for 30 minutes without leakage
3. ​​Will the color change face​ ​: Level 256 grayscale test, ensuring that the red sunset will not turn orange

Last year, the screen of a certain exhibition fell into grayscale detection - the host's face turned green and purple during the live broadcast, which turned out to be a scene of social death...

Two and five reliable quality inspection channels

​​"Sending inspection is like finding a partner, and being a good match is the most important thing"​​
▌1. ​​Official Quality Inspection Center​​

• Laboratory with CNAS/CMA target (56 companies nationwide)
• Testing fee is 500-800 yuan/㎡, but the report is universal

▌2. ​​Third-party testing laboratory​​

• Institutions that hold ISO17025 certification (recognize this code)
• Save 30% of the cost, and you can handle regular items at 300-500 yuan/㎡

▌3. ​​Manufacturer's self-inspection system​​

• Check whether the factory has a 10-meter-long aging test line (continuous oven for 72 hours)
• Check whether the X-Ray flaw detector (can detect chip soldering disorders)

▌4. ​​Industry Alliance Certification​​

• For example, the A+ certification of 8K Ultra HD Industry Alliance
• This type of inspection is particularly serious, even a 0.01mm joint is required to measure even a 0.01mm joint.

▌5. ​​Designated institutions for cross-border e-commerce​​

• You need to find JQA in the Japanese market, and you need to pass TUV in the EU.
• Don't be greedy for cheap things and look for pheasant institutions. Last year, a wholesale of goods was detained by the customs for fraudulent reports.

3. Guide to avoid pits and secrets to save money

​​Three major hidden rules that novices must know​​：

1. ​​More cost-effective for batch inspection​​：

   • 30% off for testing fees above 10㎡
   • No need to repeat the test for the same model (save 30% of the budget)

2. ​​Learn to detect vulnerabilities​​：

   • Check whether there is a temperature rise test (-40℃ to 85℃ freezing cycle)
   • Check whether EMC electromagnetic compatibility items are included (anti-signal interference)

3. ​​Use pre-check services​​：

   • Spend 200 yuan for preliminary diagnosis
   • Can detect 80% of the brightness unevenness and color offset problems in advance

The worst case I have encountered: The screen in a scenic spot did not undergo pre-checking, and after installation, it was found that level 256 grayscale could only display level 128, and it cost 180,000 more to disassemble, install and retest...

4. The secrets of selecting institutions for technical flow

​​Those who truly understand the knowledge see these details​​：

• Is the detection device Konica Minolta CL-500A (a magic tool for color measurement)
• Is there a dark room in the laboratory (contrast measurement must be completely dark)
• Can you do a 48-hour salt spray test (a basic need for beach projects)

Have a cold knowledge:​ ​The detection mechanism with motion capture device is more reliable​ ​——They can measure whether the high-speed screen has any shadows, which is too important for the stadium screen!

Personal opinion

After working in LED projects for ten years, I found a heart-wrenching truth:​ ​The saved inspection fee will sooner or later become repair fee​ ​. Last year, we counted that the screen loss point that has been tested for the full set of tests is ≤0.3‰, and the average loss point that has not been tested is 2.7‰—it looks like it is only 2.4‰, but it means that each screen will cost an extra 3,000 yuan after-sales fee. So, finding a testing agency is like finding a doctor. Professionalism is ten times more important than cheaper. Before sending the test next time, you might as well ask the other party a question: "Do your laboratory dare to broadcast the test process live? " Those who dare to show off openly are the real hardcore.

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