Ouch hey! I saw a video yesterday and almost got a laugh. The guy on duty in the mall pressed the remote control against the entire LED screen, and the fire sprinkler system was started. This reminds me of the embarrassing incident when I first entered the industry, I took out the control cabinet into parts to find the equipment switch. Today, let’s talk about this seemingly simple but hidden mystery:​How to turn off the LED display screen to be reliable​？

1. Basic shutdown operation: Don’t rush to unplug the power supply!

The most common mistake that friends who are new to this industry make is to directly pull the switch. Last year, a chain supermarket chain burned the capacitors collectively for 18 screens, and the maintenance fee was as high as 370,000 yuan. The correct shutdown posture is carried out in three steps:

1. ​Find the right physical switch​
   90% of the screen body has a button with a lock hole in the lower right corner frame (the key is usually hung on the back of the control cabinet door). The rotary switch must be turned clockwise to the bottom and hear a "click" sound before it is in place. Here is a cold knowledge:​The outdoor screen switch will be made into a double-layer structure of submarine door type​, the anti-fault touch design can withstand a level 8 typhoon.

2. ​​The remote control needs to be clever​
   Don't be crazy like pressing the TV remote control! Press and hold the power button for 3 seconds to see the indicator light change from green to red to be considered to be shut down successfully. If the button fails, try to stick the remote control within 5 cm of the receiver (this trick has solved 73% of the failure problems).

3. ​​Software control is the ultimate solution​​
   The current intelligent control system has the option of "soft shutdown". Click the power icon wearing a Christmas hat on the computer (don't laugh, it's really this style), and wait until the progress bar reaches 100% before powering off. Doing so will allow the capacitor to be completely released and the screen life will be extended by at least 2.3 years.

2. Advanced skills: You may not think of these places

Last week, I helped my friend deal with a strange case: the screen was still shiny after shutting down! Later I found out that it was the backup power supply being messed up. Here are some advanced operations:

• ​​Dual power supply equipment must be powered off twice​
  Turn off the main switch first, and then unplug the UPS backup power plug (say important things three times!)
• ​​The fan with cooling system must wait for the stop​
  You can only pull the shutter when you hear the "buzz" sound completely disappears, otherwise the motor will easily burn
• ​​Remember to remove the receiving card in the rental screen​​
  Those quick-release boxes must be turned off after shutting down, otherwise they may not be able to recognize them next time they are turned on (don’t ask me how I know)

There is a very interesting data: industry statistics show that​Regular shutdown can reduce the failure rate of LED module by 61%​​. Especially for small-pitch screens below P2.5, rough power outage will cause the light beads to beads to soar by 3 times.

3. Help! What should I do if I can't close it?

Don't panic first! Last month, I encountered a "strike" of equipment during a performance in a theater, which is actually a simple operational misunderstanding. Try these emergency plans:

1. ​Check the control card indicator​
   If the red light is always on, press and hold the reset button on the card for 10 seconds (you need to press with the ballpoint pen tip to be strong enough)
2. ​​Measure whether the voltage is stable​​
   Take the power input terminal under the multimeter volume. If the voltage fluctuates more than ±5V, you must first stabilize the voltage.
3. ​​Forced discharge method​
   After disconnecting all power supplies, use an insulating screwdriver to short the power terminal for 5 seconds (there will be a little spark, don't be afraid)

The most amazing thing is when I met an old device that time, I finally found that the scale sticker on the switch knob was sticked inverted... So,​Read the instructions in advance when encountering a strange thing​​, can save a lot of money.

4. Industry slander: These parameters determine the shutdown method

You must have heard what the master said, "Low brightness and high gray require special operations", but it is actually not that mysterious. Just remember these parameters:

• ​​Refresh rate ≥1920Hz​Screen: The software must be turned off, and there will be residual shadows when the power is directly off.
• ​​Automatic brightness adjustmentModel: Turn off the opportunity to automatically store the brightness curve, don't interrupt this process
• ​IP65 protection levelOutdoor screen: After shutting down, check whether the sealant strip is reset

There is a cold knowledge: a screen with intelligent brightness adjustment will start immediately when the power is turned off​Capacitor discharge procedure​, this process takes about 8-15 seconds. If you hear the "Zi" current sound suddenly interrupted, hurry up and check the power contact!

Personal opinion time:

If I ask me, the most magical thing in this industry is that the more expensive the equipment is, the more troublesome it is! But it is true to think about it. Precision instruments worth hundreds of thousands of yuan must be served carefully. Next time I see someone shooting and turning off the phone on the LED screen, remember to tell him:​Tenderness can last forever​, you know ~

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