Do newbies who are new to LED large screens often stand in front of the equipment to scratch their ears and faces? I clearly saw the screen light up, but I couldn't find where the shutdown key was. You can't just unplug this thing like a TV at home, right? Today I will take you to solve this seemingly simple operational problem but actually hidden mystery.

Let me first talk about a real case: Last week, a shopping mall operator forced a display worth millions to push out three black lines. He accidentally touched the debug mode button, and the entire screen seemed to be scratched by a knife. So,​ ​Finding the shutdown position is much more important than turning on the computer​​This is related to the life of the equipment and the maintenance cost!

1. Don’t rush to unplug the power supply! Find these two key locations first

Today's LED displays are no longer the same as old-fashioned TVs. If you want to turn off the phone, you have to figure out the device structure first. ​ ​80% of the switches are hidden in two places​​：

1. ​​Side of the control box​​: The metal box that looks like a safe is usually on the back or bottom of the screen. Pay attention to whether there are any red buttons with lightning symbols
2. ​​Splicing unit gap​​: Especially for modular products such as rental screens, find the raised knobs between adjacent boxes

Alas, here is a cold knowledge: some outdoor advertising screen emergency switches are actually hidden in the lamp bead array! The control panel must be popped up by touching a specific area with a matching magnetic rod. This design is mainly to prevent misunderstandings, but it has indeed caused many novices to suffer.

2. Shutdown guide in different scenarios

Let me give you a practical comparison table to ensure that you master the key points in three minutes:

Take a chestnut, like the transparent display that can be used as a mirror, you need to pay special attention when turning off the phone.​​Turn off the software first and then the hardware first​​. Otherwise, the residual current will cause electrostatic spots to be generated on the glass substrate, just like dust is inserted into the mobile phone film, which will be difficult to repair.

3. Five pitfalls that novices often step on

Last week, the technical department counted the annual maintenance work orders and found that these operational errors were the highest:

1. ​​Pull the switch directly​​(Accounting for 43% of the fault)
2. ​​Press and hold the power button for more than 10 seconds​​(Cue the system lock)
3. ​​Wet hand operation knob​​(Cause contact oxidation)
4. ​​Forgot to close the scheduler​​(The automatic power-on is turned on in the middle of the night and scares passers-by)
5. ​​Brightness adjustment key accidentally​​(Creating an abnormal display the next day)

You may ask: What if you really can't find the switch? Don't panic at this time, remember this universal formula——​ ​"Three look at three and three don't touch"​​：

• Read the equipment manual (usually in the control box mezzanine)
• Look at the direction of splicing structure
• Check the distribution of heat dissipation holes
• Don't touch any area with warning stickers
• Don't touch the flashing indicator light
• Non-original accessories socket

4. Special circumstances handling manual

When encountering these difficult situations, don't mess around with yourself:

• ​​Snowflakes appear on the screen​​: Stop the operation immediately and check whether the signal line is loose
• ​​There is still light after shutdown​​: This is the residual capacitor phenomenon, and it will automatically disappear after 20 minutes.
• ​​There is no response when pressing the button​​: It may be that the anti-touch mode is activated, and you need to press and hold the "+/-" key at the same time to unlock it

If the equipment is installed on a ten-meter-high outdoor advertising rack, don't learn to climb a ladder in the movie. Nowadays, many high-end screens support remote control of mobile phones, and can shut down the phone safely by connecting to the exclusive APP. However, remember to let the manufacturer activate permissions in advance, this function is not enabled by default.

Editor's opinion: In fact, finding the shutdown key is like playing escape room. The key is to understand the thinking of the device designer. Next time, if you cannot find the switch, you might as well observe whether there is a hidden touch bar on the screen bezel, or see if there is a mode switching key on the back of the remote control. If you really can’t handle it, just contact the after-sales service directly. It’s safest to leave professional matters to professionals.

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