Alas, I've always seen newbies asking about this recently. You said that when online shopping platforms search for hundreds of thousands of links, the prices range from hundreds of thousands to hundreds of thousands of dollars, which makes people dazzled. Last week, a friend spent 30,000 yuan to buy a screen, but when he installed it, he found that the brightness was not enough, and it seemed like a layer of gray in broad daylight. This matter is causing trouble...

1. Find three major pits on the road, and if you step on one, you will be useless.

You may not believe it. I have sorted out 278 procurement dispute cases in the past two years and found that these three pitfalls are the most deadly:

1. ​​Brightness virtual mark trap​: Some merchants sell indoor screens (800cd/㎡) as outdoor screens. When the buyer receives the goods, he finds that he can't see clearly under the sun. This case accounts for 43% of the total complaints.
2. ​Pixel dot matrix trick​: If you use second-hand refurbished lamp beads to pretend to be a new product, there will be a large area of ​​dead lights in three months, and the re-repair cost is 30% more expensive than the new one.
3. ​​The power system shrinks​: Secretly changing industrial-grade power supplies to civilian-grade, causing the screen to suddenly be black while using it, and shopping mall activities are everywhere

​​The key point is here​: For a truly reliable display screen, the parameter table will definitely state the specific numerical range of "intelligent brightness adjustment (indoor 800-1200, outdoor 4000-7500)". 80% of those who only write "high brightness" and "ultra-clear".

2. Comparison table of searching for goods

Last week, a restaurant owner complained to me that the second-hand screen he bought on a certain fish looked quite new, but the electricity bill soared after using it for two months. Later, he found that the power module was aging and it cost more than 8,000 yuan to replace the power supply alone.

3. Five must-see parameters for experts to choose screens

1. ​​Refresh rate​: The screen below 1920Hz, the phone is full of water ripples when you shoot it, and live broadcast will definitely be ruined
2. ​​Grayscale​: The 16-bit screen can display 980,000 colors, and 8-bit only has 65,000 colors. Put the gradient background and reveal the filling immediately.
3. ​​Protection level​: The outdoor screen requires at least IP65, and you don’t have to worry about being cool when it rains.
4. ​Power consumption index​: The electricity consumption per square meter per hour is the normal range. If it is too low, it will definitely cut corners.
5. ​​Warranty period​: Manufacturers who have been insured for five years must use military-grade chips

A friend of the wedding told me that he had bought a miscellaneous screen with greed for cheapness. Once the newcomer's name was displayed as garbled and almost sued by the customer to the Industrial and Commercial Bureau. Later, I changed my supplier with real parameters, and this kind of trick never happened again.

4. Xiaobai’s three tricks to avoid lightning

​​Q: How to quickly determine whether the manufacturer is reliable?​​
A: I will teach you three tricks:

1. ​​Don't listen​: Let the sales site open the project mode and see the actual running time (the new screen should be ≤50 hours)
2. ​Touch the heat dissipation port​: After working for two hours, the temperature of the box will definitely not be able to dissipate heat exceeding 45℃.
3. ​Check the certification code​: Check the CCC certification number and find out the authenticity of the official website. It is impossible for counterfeit manufacturers to do so.

I heard that during the acceptance of a project last year, Party A illuminated the screen frame with an ultraviolet light, illuminated the hidden renovation mark, and directly deducted the final payment of 30%. Now all industry acceptances are equipped with portable detectors, just like treasure appraisal.

5. Installation and maintenance cost list

Many people only calculate the money for buying screens, but the subsequent expenses are actually the big ones:

• ​​Installation fee​: Additional charges of 80-150 yuan per square meter for high altitude operations
• ​​Electricity bill​: The 100㎡ screen is turned on all day, and the electricity bill is enough for a month to buy an electric car
• ​​Repair fee​: It costs 200 yuan per driver IC chip, and there are thousands of chips on the entire screen...
• ​Upgrade fee​: The system will be replaced every three years, and the upgrade package will be less than 20,000 to 30,000 yuan.

A shopping mall manager told me that their screen maintenance fee for five years is enough to buy half a new screen. So now smart people choose to use remote diagnosis function. If they fail, they can directly report to the cloud, which can save a lot of running expenses.

Recently, the industry has released new data, saying that the screen failure rate of procurement through formal channels is 67% lower than that of informal channels. But let me say, finding a screen is like finding a partner. Just looking at the appearance parameters is useless, the key is to look at "inner beauty". Next time you see a salesperson who is full of fantasy, you might as well let him explain every number in the parameter table clearly - the one who can take out the test report on the spot is the real reliable one.

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