Have you encountered this situation? The LED screen that costs a lot of money starts to become darker in less than half a year after using it, as if it has "allar alopecia areata". My cousin suffered this loss when he opened a shopping mall. At the opening ceremony, the main screen suddenly dropped by one-third, which made him so anxious that he almost smashed the console. Let's talk about it today​What is the root cause of LED dark screen?​, I will teach you some tips to avoid pitfalls.

​​First break the industry window paper: 90% of the dark screen problems are not the screen itself at all​​
Last year's industry report showed that in the LED display repair cases,​67% of the faults are actually in the power supply system​. Just like if a person does not provide enough blood, he will feel dizzy, and if the screen voltage is unstable, the light and darkness will appear uneven. What's even more outrageous is that in order to save trouble, some installation teams plug the controller in a confined space, and poor heat dissipation directly leads to capacitor explosions - I have seen this low-level error three times with my own eyes.

​​The core secret is hidden in three invisible places​​

1. ​​Power module layout​: Like the capillaries of the human body, distributed power supply is 30% stable than centralized power supply
2. ​​Heat Dissipation Channel Design​​: The heat dissipation efficiency of aluminum-magnesium-zinc alloy box is 2.8 times faster than that of ordinary materials
3. ​Signal transmission protocol​: The screen using HDMI2.1 is 5 times more stable than the old-fashioned interface data transmission

Last month, I visited the aging workshop of a company and saw an engineer holding a thermal imager to detect the temperature of the module one by one. The person in charge said that each screen they had to pass through72-hour continuous roaster test​, if the temperature fluctuates more than 3℃, it will be reworked directly. No wonder people dare to promise three years of maintenance-free.

​​Newbie's Guide to Avoiding Pits (Money Saving Version)​
When helping my friend inspect the large screen in the gymnasium, I prepared three basic methods:

1. Play 30 minutes of pure white screen, use your phone to slow motion to shoot the screen,​Stop immediately after finding flash​
2. Put the back of your hand on the screen border,​The temperature difference exceeds 15 degrees indicates that there is a problem with the heat dissipation​​
3. Required to view​Component Supplier List​, the power supply IC must be a first-tier brand

For example, a dark area appeared after using the ground screen at a concert for three months. The inspection found that the aging of the waterproof glue strip caused moisture invasion. Later, the box structure with drainage tank was used, and combined with IP65 protection, and there was no problem in the same environment. So say​Dark-proof screens must be grabbed from the source of design​​, later repairs will all treat symptoms but not root causes.

​​Exclusive data reveal​
Industry internal monitoring shows:

• Screens with intelligent brightness adjustment technology reduce light decay speed by 45%
• Control system with automatic correction function can extend the screen life by 2-3 years
• Modular design saves 60% of the repair cost than traditional structures

Recently I heard that there is a black technology that can predict screen attenuation trends through AI algorithms and replace modules that are about to fail in advance. It's like installing an "electrocardiogram" on the screen. If you have any problems, you will know it. But I would like to remind you,No matter how good the technology is, it must be installed in accordance with standardized installation​​, the most outrageous case I have ever seen is that the control box is installed in the bathroom partition, and the erosion of water vapor leads to the scrapping of the entire system.

The editor finally nagged: Next time I meet someone who sells LED screens, don’t just ask "How much is a square meter", remember to24-hour uninterrupted test video​, look at the maintenance channel design drawings. After all, it is really tough to spread the internal structure to you these days. By the way, those sales who say "whatever is OK" are recommended to block them directly!

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