Standing in the atrium of the mall, looking up, the LED screen was dazzling, but do you know? The price difference between the same size of the display screen can be more than three times! Last month, my cousin suffered a great loss when he opened a store. He spent 48,000 yuan to install the screen, and after using it for two months, the color blocks broke out. Later, when he opened it, he found that it was a second-hand module from five years ago...

Model code with hidden mystery

Let’s first talk about this string of alphanumeric combinations that look like garbled codes. For example, a certain screen is marked "NS-P3.9-1920H", but there are three messages hidden here:

• ​​P3.9​ ​: Pixel spacing 3.9 mm (the smaller the number, the clearer it is)
• ​​1920​​: Refresh rate ≥1920Hz (the larger the number, the more stable the picture)
• ​​H​ ​: Represents high protection level (look for more durable with H/R/S suffix)

A restaurant owner complained to me that the screen parameters he installed were "P4-3840", but actually played 4K videos but were blurred into mosaics. Later I discovered that 3840 refers to resolution rather than refresh rate, and this kind of concept-changing routine is uncommon in the industry.

The way to the certification mark

Don't underestimate the stickers on the corners! A truly powerful manufacturer will have at least these three certifications:

1. ​​CCC​ ​(Mandatory Chinese Authentication) - Identity Card equivalent to the display screen
2. ​​IP65​ ​Protection level - Only those who can prevent water from spraying dare to install outdoors
3. ​​Energy efficiency marking​ ​——Level 2 or above to save power

Last year, the screen installed in a gym suddenly turned black. I found that the power module did not pass the CE certification at all. Nowadays, people who know how to inspect goods will use flashlights to shine the anti-counterfeiting laser marks at the joints. This technology is extremely costly to counterfeit, and it is more reliable than reading ten inspection reports.

Craft details visible to the naked eye

Teach you a trick:​ ​Touch the screen splicing seam with your hands​ ​. A good product can do:

• The gap is ≤0.1mm (the nails are scratched without any sense of blockage)
• No burrs in the four corners (smooth as touching the edge of the phone screen)
• The heat dissipation holes are arranged neatly (it is comfortable to see after obsessive-compulsive disorder)

A mall property manager revealed that they now use a 20x magnifying glass to look at the solder joints. The solder joints of high-quality products should be as round and full as millet grains, while those with bumpy pits are mostly workshop products.

Self-question time

Q: Why is the price difference between the same parameter screen so big?
A: The core is​ ​Lamp bead brand​ ​and​ ​Driver chip​ ​! Just like the same 2.0T engine, can Mercedes-Benz and Zotye be the same price? But profiteers won't tell you this, they will only brag about "imported materials".

Q: How to inspect goods when purchasing online?
A: Try to these two details:

1. Requires unopened packaging serial number
2. Video verification boot-up display parameters
   Now some manufacturers are playing "parameters false labels" and selling P4 screens as P3s. When consumers find out, the return period has long passed.

Q: How to distinguish between rental screen and fixed screen?
A: Look at the thickness of the box! Rental screens are usually ≤100mm and have a quick disassembly structure, like a Transformer joint. In order to dissipate heat, the fixed screen starts at least 150mm in thickness.

Last month I visited an automation factory and saw the robotic arm performing a 48-hour aging test on the screen. Lao Zhou, the director of the assembly line, said that each screen now has to undergo the extreme test of high temperature of 200℃ and low temperature of -40℃. No wonder they dare to use it for five years. So remember that choosing an LED screen is like buying an air conditioner - those who are willing to spend the cost in invisible places are the real conscientious manufacturers. Those who are so singular but dare not let you look at the production line will definitely have a ghost in their hearts!

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