To be honest, when you touched the back cover of the LED screen for the first time, were you also like a headless fly pressing around? Last week, my neighbor Lao Wang took over the shopping mall's large screen maintenance and pressed the tuning button as the motherboard switch for half an hour. Today I will take you to play "Everyone finds fault" and teach you how to understand these mechanism buttons hidden in the steel jungle.

/// Basic Literacy ///
​​Remember this sentence first: the motherboard button is not for you to press casually​ ​. There are usually three key areas:

1. Red boat switch next to the power connector (looks like a rice cooker switch)
2. Reset button above the receiving card slot (black bulge as the size of sesame)
3. Five-way navigation keys for system debugging (hidden under the waterproof glue pad)

Before the New Year's Eve countdown in a shopping mall in Tokyo last year, the staff could not find the forced restart button, but later they found that it was covered with a transparent protective film. This design prevents accidental touch is a good thing, but it is really a rush in the emergency.

/// Model Differences ///
The screen structures of different scenarios vary greatly:

• The buttons on the outdoor advertising screen are all in the waterproof compartment (four screws are required)
• The operation panel of the transparent window screen is hidden in the frame groove (it must be sucked out with a magnetic suction tool)
• The rental screen is the most user-friendly, the buttons are exposed directly and have fluorescent logos

There is a cold knowledge: for models with IP65 protection, the button must be pressed for three seconds before it can take effect, and it is designed to prevent mistakenly touching. Previously, during the competition at the Seoul Esports Hall, some viewers leaned against the screen and touched the button by mistake. Now the new model has physical locks.

/// Emergency Operations ///
Don't panic when you encounter a black screen of death, follow this order:
① Find the power switch (first power off for 30 seconds)
② Poke the small hole (just use a paper clip)
③ Press the function key + confirm button for five seconds (to resume mode)

Last month, the circular screen of a Shenzhen exhibition hall lost control. The maintenance master rescued the system by pressing and holding the ▲ and ▼ keys at the same time for ten seconds. Remember to post an operation note in the chassis in daily life, which can help you at critical moments.

/// Advanced skills ///
To become a master, you have to master these:

• Press the menu key + power button to enter the project mode (it can be seen in the running time)
• Quickly click the reset key to reset the color parameters three times
• Press the brightness key for five seconds to unlock the hidden menu

I heard that the latest models already support mobile APP control, but traditional physical buttons still have to be able to operate. Just like now, we all use smartphones, but we always have to have a flashlight at home, right?

Next time you see a large screen playing naked 3D advertisements in the mall, you may wish to pay attention to the position of the lower border. If you find an operating panel with a lock hole, there will be a complete control system hidden inside. When you really can't handle it, it's safest to contact the manufacturer directly to provide technical support - I heard that some manufacturers will answer the phone call at 3 a.m. in seconds, and can also video guide the disassembly of the chassis.

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