Have you encountered this situation? The newly purchased LED screen is bright and I can't find the button if I want to adjust the brightness, so I scratched my head in a hurry. As an old driver who has been in the display industry for eight years, today I will take you to see the hiding places of these buttons. After custody, you are even clearer than the installation master!

​​1. Seventy-two changes of buttons​​
Let me talk about a cold knowledge first: 90% of LED screens on the market now do not use physical buttons! Last year's industry report showed that 83% of mid-to-high-end devices switched to virtual touch + physical key combination design. But don't panic, remember these three universal positioning methods:

1. ​​Touch the border to find the bulge​​
   Touch slowly along the screen border, especially at the lower right corner. Many manufacturers will make 0.5mm micro-convex design, which feels similar to the home button on your phone. One customer is even more amazing. He just took the lipstick and scratched the border. The button area should be the button area when it hits stutter.

2. ​​Follow the clues​​
   There must be mystery near the motherboard! Find the power interface and touch the left 15cm, and you will probably touch the button area. Last week, I helped the mall debug equipment and found a weird design - the button was actually hidden in the dust cover of the HDMI interface. There was no one else in this brainwalk.

3. ​​Power-off method is good​​
   Really can't be found? Try this trick: turn off the power and wait for 10 seconds, and stare at the four corners of the screen when restarting. Some manufacturers will set up a 3-second OSD menu pop-up window, and then quickly remember the prompt operation position.

​​2. Setting menu survival guide​​
I finally found the button, don't rush to press it randomly! First understand these hidden functions:

Focus on​​Engineering Model​​This treasure function: When adjusting the screen for the gymnasium last year, I found a magical operation - adjusting the refresh rate from 1920Hz to 3840Hz in the engineering mode, and the high-speed movement of the athlete will no longer be distorted. However, Xiaobai is careful when entering, and adjusting the wrong parameters may turn into bricks directly!

​​3. The mobile phone turns into a remote control in seconds​​
Nowadays, the mobile APP control is popular, but veteran drivers tell you three must-see parameters:

1. ​​Bluetooth version​​
   If you choose one above 5.0, the transmission distance can reach 30 meters. The most outrageous case I have ever seen: the supermarket manager used the APP to control the screen with version 4.2, but the display screen in the freezer area was exhausted every day, and finally found that the Bluetooth signal was interfered with by the refrigerator.

2. ​​Protocol Compatibility​​
   The focus is on whether the support does not support the Art-Net and sACN protocols. At the music festival last year, a team used a console that was too old and turned the million-dollar floor tiles screen into a marquee. It was a lesson to be taught by blood and tears!

3. ​​Permission rating​​
   Administrator/operator/visitor level three permissions must be separated. Don’t laugh, there is a hot pot restaurant that makes the waiter accidentally touch the brightness adjustment. The promotional information at noon has become a "invisible mode", and the customers can’t find the QR code to pay.

​​4. Metaphysical Troubleshooting​​
Don't curse yourself when the button fails. Try these folk remedies:

1. ​​Electrostatic elimination​​
   Wipe the button area with an anti-static cloth (if not, use a wet tissue). Last winter, I repaired the screen for the bank and found that it was the staff's sweater that caused the button to fail. Who could have thought of this?

2. ​​A miracle​​
   For older devices, sometimes hard-pressing bezels are more effective than anything else. But attention! Last month, I saw a big brother slapped the border into a concave, and the repair cost was more expensive than changing buttons.

3. ​​Freezing method​​
   Yes, you heard it right! After powering off the equipment, put the refrigerator freezer for 15 minutes, and the oxide layer on the main board may re-contact. This trick is very useful for moisture-affected equipment in coastal areas, and I personally test the advertising screen that has saved the seafood market.

​​The editor says​​
If you ask me, finding a button is like falling in love - you have to feel it with your heart and don't force it. Those manufacturers who design buttons to be anti-human are sooner or later taught to be human. Next time you encounter a screen that you can't understand, remember that the 24-hour technical response is not a decoration. If you need to shake people, shake people. After all, professional things have to be done by professionals, right?

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