Hey guys, have you ever had this happening? Looking at the cool LED screen in the mall, a dark area suddenly became black. The repairman held the equipment and touched the screen behind it, but he couldn't find the control mount. Let’s talk about this question that makes novices crazy today - where is the "brain" of the LED screen hidden?

1. What is the control mount?

​​Q: This thing sounds like a car part, what does it have to do with the display? ​ ​
Simply put, it is the "nerve center" of the LED screen, like a combination of a computer motherboard and a CPU. To give a down-to-earth example, the APP interface on your mobile phone can be displayed normally, and it depends entirely on the processor to work in the background.​ ​The control card is what does this job​​！

Three core functions must be known:

1. ​​Signal Translator​​: Convert computer signals into languages that can be understood by LED light beads
2. ​​Power dispatcher​​: Accurately allocate the power supply in each area
3. ​​Fault alarm​​: Which light bead strikes it first knows

Last year, a shopping mall suddenly showed garbled codes, which means that the control card detected that the temperature was too high and automatically activated the protection mode. Do you think this thing is heavy?

2. Three major rules of hiding place

​​Q: Why are some on the side and some on the back? Is there any rule to follow? ​ ​
It depends on the screen structure. After I observed hundreds of display screens, I summarized three golden laws:

• ​​Outdoor screen​​: 90% hidden in the waterproof box, usually located in the upper right corner of the screen (rainproof water gathering)
• ​​Rental screen​​: Directly integrated into the groove on the back of the box, protected by magnetic cover plate
• ​​Transparent screen​​: The most thief! Spread inside the border, there is a control node every 2 meters

There is a cold knowledge you may not know:​​Screen with IP65 protection​​, the control bayonet will have an extra layer of silicone sealing ring, so you must pay special attention not to break it when disassembling and assembly. Last time I saw a master violently dismantling it, but the seal ring deformed and caused water to enter, which cost less than 20,000 yuan!

3. Common fault location methods

​​Q: When there is a problem with the screen, how do you determine whether it is a problem with the control card? ​ ​
Remember this "three views and one listen" formula:

1. look​​Fault range​​: The black screen may be a power problem, and the local black block is probably a control card failure
2. look​​Indicator light​​: When working normally, the green light is always on, and the red light flashes, which means the alarm is being called
3. look​​Temperature changes​​: Touch the housing temperature, turn off the machine immediately after exceeding 60℃
4. listen​​Alarm sound​​: High-end control cassette buzzer, different frequencies represent different fault types

To give a real case: a stadium fence screen has vertical stripes, which means that the control card signal port is poorly contacted. The master used a local method - use an eraser to wipe the gold finger interface and solve the problem immediately. Do you think it's magical?

4. Hidden skills for daily maintenance

​​Q: Does this thing need regular maintenance? ​ ​
Don't think that just install it! Teach you some tips for extending your life:

• Use monthly​​Compressed air tank​​Clean up dust (don’t blow with your mouth, saliva will corrode the circuit)
• Quarterly inspections​​Cooling fan​​, change to new ones immediately if it doesn't turn smoothly
• The rainy season starts at least 2 hours a week to drive away the tide
• When encountering thunderstorms,​​Unplug the network cable in advance​​Any lightning protection device works better

The most exaggerated case I have ever seen: the LED sign in the Internet cafe has not been broken for 8 years. The boss’s secret is to clean it up regularly on the 15th day of every month, which is even more punctual than worshiping the God of Wealth!

5. Forecast of future development trends

There are two new trends in the industry that are worth paying attention to:​​Wireless control​​and​​Intelligent diagnosis​​. I heard that the latest control card can transmit signals through Wi-Fi6, so I no longer have to worry about the network cable being bitten by a mouse. Some manufacturers have developed AI self-test systems, and the accuracy of fault prediction is said to reach 98%.

However, ordinary users should not rush to pursue new things. The old saying goes, "three-point products and seven-point packages". No matter how good the control card is, it must be coordinated with standardized construction. Those wireless control cards that claim to be able to transmit 200 meters may be halfway through the actual transmission distance in the steel and concrete building. This is a lesson learned from blood and tears!

If you want me to say, finding a control checkpoint is like playing escape room, you have to master the rules and don’t touch them. Remember the key points​ ​Find the corners of the waterproof screen, look at the back of the rental screen, and check the borders of the transparent screen​​These three memorizations. Finally, I would like to say, don’t tear it down by yourself! I have seen too many cases of complicated simple problems, so I should leave professional matters to professionals. After all, good display manufacturers are equipped with 24-hour technical support, and they can provide remote guidance with just one phone call. Isn’t this much better than just making trouble?

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