Have you ever encountered such an embarrassing situation? When the mall was closed, I saw the ten-meter-high LED screen flashing constantly. Seven or eight security guards were scratching their ears and heads around the console, but they couldn't find the shutdown key? Last week, a shopping mall manager was so anxious that he stomped his feet: "This screen is not a mobile phone, so you can't just unplug the power supply, right?" Today we will break it up and talk about this seemingly simple but actually hidden mystery problem-​—​​How to turn off the LED display?​​

(Secretly tell you that the data shows that more than 60% of screen failures are caused by wrong shutdown, which is not a scare.)

1. First understand: shutting down is not as simple as pressing a button

Newbie who are new to LED screens are most likely to make two mistakes: either look for physical buttons on the screen, or directly pull the switch. It's like looking for the microwave switch with a remote control, not on the same channel at all. The key point is -​The shutdown of modern LED screens is a combination of punches​, you have to follow the steps.

To give a real case: At a music festival last year, an electrician directly cut off the total power supply in order to save trouble, but as a result, a rental screen worth one million yuan burned 1/3 of the lamp beads on the spot. Why? Sudden power outage will cause the program in the control card to "jamm" like a sudden sudden brake when driving at high speed.

2. Teach you step by step to find the shutdown portal

Let's take three steps to keep you from becoming an expert:

​​1. The software system is the commander-in-chief​
Turn on the control computer and find the "Shutdown" option in the management system. Here is a cold knowledge: professional-level LED control software usually hides the shutdown key in the third-level menu, for fear of accidentally touching it. The specific path is generally:

• Gear icon in the upper right corner of the main interface
• System maintenance → Equipment management
• Select "Safe Shutdown" instead of shutting down the program directly

​2. Hardware equipment must be laid off in line​
Don't rush to leave after closing the software, and then process these hardware:

• ​​Power timer​​: In the order from right to left (the larger the number, the lower the priority is)
• ​Video Processor​: Wait until the indicator light turns from blue to red before power off
• ​​Send Card​: Wait for another 30 seconds after seeing the screen completely black

​3. Finally, the main power gate is activated​
Only after confirming that all devices have completed the shutdown procedure can the air switch be turned off. At this time, you can touch the heat dissipation hole - if it is still hot, it means that the internal components are still working, so you have to wait a little longer.

3. The pit we strayed in those years

I will tell you a few lessons from blood and tears to save you maintenance costs:

• ​​Don't turn off the phone on heavy rains​: Sudden power outage can easily invade moisture (a gymnasium has lost the entire waterproof screen)
• ​​Don't rush to close the show​: The high-power screen needs to wait for the cooling fan to stop before powering off (there is a theater screen that melts the cable due to residual heat)
• ​Remote control has delay​: After turning off the phone with the mobile APP, be sure to confirm the screen status on site (a brand flagship store has suffered this loss)

4. How to break special scenarios?

Don't panic when encountering these situations, and teach you how to deal with them:

• ​​Emergency​: Press and hold the emergency stop button first, then turn off the machine according to the normal process
• ​System stuck​: Press and hold the "menu+confirm key" at the same time for 10 seconds to force restart
• ​​Scheduled shutdown​​: Set the time in the control software, the error is no more than 3 seconds

Take the plan we made for a music festival as an example. The stage director has a customized remote control. When shutting down, press the red key to unlock the interlock, then press the green shutdown key, and finally you have to brush your fingerprint to confirm. Although troublesome, it is absolutely safe.

5. Why do professional things need to be done professionally?

Seeing this, some friends may want to argue: "It's so complicated to turn off the screen, can't the manufacturer design a one-click shutdown?" As an engineer who has been in the industry for ten years, I must tell the truth:It's not that I can't, but I dare not​. LED screens cost hundreds of thousands of dollars, and multiple protections must be set:

1. Anti-missive touch mechanism (requires three consecutive points to confirm)
2. Status self-test program (automatically check for hidden dangers before shutting down)
3. Emergency power supply module (release the control card for 3 minutes if it suddenly powers off)

Just like a high-end car needs to plug in the key, press the brake, and press the start button to turn off the engine, the more precise the equipment is, the more standardized the operation is. Those counterfeit screens that claim to be "one-click shutdown" will only be wrong after half a year of use.

Next time, if you encounter a situation where the screen cannot be turned off, don’t rush to call the manufacturer first. Follow this self-examination list to go:

1. Is the latest version of the control software?
2. Is the power sequencer wiring loose?
3. Is the cooling system working normally?
4. Is there a timed turn-on and shutdown setting?
5. Have you upgraded your firmware recently?

If you can't handle it... guess what I'm going to say? Yes, hurry up and contact the engineer who installed the screen. After all, professional equipment needs professional maintenance. Do you think this is the reason?

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