1. Must-read for beginners: "Hidden Levels" of magnets in LED screens

Have you encountered this situation? Looking at the cool LED screen in the mall, I murmured in my heart:​How do these screens be installed like building blocks? What mechanism is hidden behind it?​​ Especially those display screens that can be disassembled and assembled quickly. I heard that they all rely on magnets to absorb, but where is the specific magnet hidden? Today we will take apart the "coat" of the LED screen and see how this key component works.

2. The "Golden Triangle Zone" of magnet installation

By dismantling the mainstream LED screen structure, it was found that the magnets were mainly distributed in three core areas:

1. ​Module four corners​(Over 80% of the installation points)

   • Each module has a magnet in each of the four corners, which is positioned accurately like a tempered film on the mobile phone.
   • The error of the magnet hole position must be ≤0.5mm, otherwise the "seesaw" phenomenon will occur if the adsorption is not firm.

2. ​​Case connection​(Key Position of Large Screen)

   • The outdoor advertising screen box is reinforced with M4-specific magnetic columns, which can withstand strong winds of 8 levels
   • Stadium fence screen is equipped with 6-8 strong magnets per square meter to prevent dislocation from collisions among spectators.

3. ​​Special structural seams​ (Exclusive design of creative screen)

   • The arc screen encrypts the magnet layout on the inside of the curved radius
   • The transparent screen adopts invisible magnetic structure to ensure that 86% transmittance is not discounted

3. Teach you step by step to find the magnet position

​​Third practice steps, novices can become experts:​

1. ​​Electric autopsy method​

   • After turning off the power, tap the surface of the screen, and the hollow sound area is the magnet position
   • Scan with a magnetic tester. The point with a value of > 1200 Gauss must be the installation position

2. ​​Back plate perspective method​

   • Remove the back panel of the module and observe the position of circular depressions or threaded holes.
   • Outdoor screen magnets will be marked with IP65 waterproof logo (like a small umbrella icon)

3. ​​Decomposition and assembly verification method​

   • Hold the edge of the module and pull it outwards to feel the strength and weakness of the adsorption force
   • The professional screen body disassembly and assembly force is controlled at 3-5 kg. It is too difficult to make the magnet installed in a wrong way.

4. Choose the right magnet specifications to save worry and money

Common magnets on the market are like mobile phone models, and different "versions" should be used in different scenarios:

​​Tap Avoidance Guide:​

• Don't be greedy for cheap and choose sticky magnets without threads. It is easy to "take off your pants" in high temperatures in summer.
• The M4 specifications of the indoor screen are purely wasteful, just like installing an airplane engine on a bicycle
• Coastal areas must choose 316 stainless steel magnetic columns, and ordinary galvanized magnets will rust after half a year.

5. Three major questions you may ask

​​Q: Will excessive magnets interfere with screen signals?​​
A: A good question! Professional screens have been made​Electromagnetic shielding treatment​, for example, copper-nickel alloy is plated on the outer layer of the magnet. The actual data show that after the 1920Hz refresh rate screen is equipped with a magnet, the signal distortion rate is <0.03%, which does not affect the smoothness of the picture at all.

​​Q: Can you modify the magnet yourself?​​
A: This is like performing bypass surgery on the heart - it looks simple but is actually high-risk. A user once changed the magnets themselves, but the result was:

• The magnetic pole is in reverse direction, and the module "same sex repulses" directly bounces away
• Too strong magnetic force causes magnetization of PCB board components
• Thread mismatch twists the mounting hole into "slip wire"
  ​​Correct way:​ Find an original manufacturer to buy a special magnet with code, just like a mobile phone charger must be equipped with original assembly.

​​Q: How to judge the expiration of the magnet life?​​
A: These three signals indicate that it is time to change the magnet:

1. A gap of more than 0.5mm appears on the edges of the module
2. There is a "cry" sound when pushing the screen
3. Water mist appears on the surface of the screen after rainy days (sealability decreases)

6. Editor's opinion

After working on the display screen for so many years, I have seen too many tragedies in which "a magnet destroys the entire screen". Last year, a customer used a counterfeit magnet for cheapness, but the large screen collapsed on the press conference and directly lost millions. So,​Choose magnets is like finding a partner - the most important thing is to be a good match​​. Those manufacturers who dare to promise that "magnets will last for 10 years" are supported by thousands of tens of thousands of times of tension test data in the laboratory. Next time you touch the LED screen, you might as well think of these "little magnets" hidden in the dark. They silently carry the backbone of the entire visual feast.

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