I wonder if you have ever encountered this situation - the large LED screen that is playing advertisements suddenly turns green, or the display screen in the mall has green patches inexplicably? Two days ago, a friend who works in a supermarket asked me anxiously: "This broken screen is as green as the stock market. What is wrong with it?" "Today we will talk about this problem that causes newbies a headache.

When it comes to LED display repair, the first reaction of many novice users is to search for "LED display repair tips" online. However, according to industry data, 80% of display abnormalities actually originate from basic faults. Let’s not panic first and clarify the most common problems. The following comparison table can help you quickly locate the problem:

​​The most dangerous situation is when the whole screen turns green​ ​, I encountered it last year at a convenience store chain. Their outdoor advertising screen suddenly turned green, and it turned out that the signal processing chip of the main control card had burned out. At this time, be sure not to disassemble the phone yourself, but contact a professional immediately - especially if the screen temperature rises abnormally, there may be a risk of short circuit.

If we encounter local greening, we can investigate it ourselves first. Shine your phone's flashlight at the screen to see if there are any obvious black spots or cracks in the green area. Here is a simple method: gently press the abnormal area with your hand. If the color changes, it is probably because the cable is loose. But be careful, don’t operate outdoor screens like this, high voltage electricity is dangerous!

When it comes to signal transmission, many novices tend to ignore data lines. I once checked for a friend and found that he used an ordinary HDMI cable to connect to the control computer. As a result, signal interference caused the screen to turn green intermittently. ​ ​Professional engineering screens must use shielded twisted pairs​ ​, especially when the transmission distance exceeds 20 meters. Here’s a little trivia: Failures caused by inadequate wire quality account for more than 35% of annual repair cases.

The issue of driving power supply is also worth noting. The most outrageous case I have ever seen is that the floor tile screen in a shopping mall was humid during the rainy season and the power module was rusty, causing the output voltage to be unstable. The entire screen turned green like a lawn. In this case, the power should be cut off immediately, use dehumidification equipment to deal with it, and then power on for testing.

Eight out of ten newbies will fall into this pitfall of software setting errors. Especially when novices operate the control software, accidentally adjusting the color mode to monochrome output, or setting the gamma value abnormally, will cause the screen to turn green. There is a simple way to judge: connect to the computer and see if the preview screen in the control software is normal. If the preview is normal but the screen display is abnormal, then there is a high probability that there is a hardware problem.

When it comes to hardware maintenance, we must remind everyone:​ ​Don't believe in the "universal maintenance guide""​ ​. Last year, a customer replaced the module by himself, but the entire box circuit burned out, which cost him more than 20,000 yuan in repair costs. Especially for engineering screens with IP65 protection, improper disassembly and assembly will damage the sealing structure and make it easier for water to enter later.

Finally, let me talk about some industry knowledge: it is normal for some screens to turn green. For example, a transparent screen using a special wavelength LED chip will show a light green halo at a specific angle. This is a product feature and not a fault. However, in this case, the manufacturer will explain it in advance. If you don't inform it when you buy it, you have to be careful.

Don’t put it off when you encounter problems. LED screen failure is like getting sick. Early detection and early treatment are required. Especially for display screens in commercial places, every hour of downtime is a real loss of money. Many regular manufacturers now provide remote diagnosis services. Take a video and send it to the technician, and the technician can make an accurate diagnosis through the screen. Remember, professional matters still have to be left to professionals.

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