Alas, why do you think this LED display is like hide and seek now? Last week, he helped his friend debug the shopping mall advertising screen. He held the USB flash drive three times but couldn't find the socket! This is really not an isolated case. Eight of ten beginners fell in this first step. Today I will take you to "touch through" the display screen, and you will be clearer than the master after watching it!

1. "Treasure Map of Different Devices"

​​1. Outdoor advertising screen: the mystery in the repair mouth​​
Just a big guy who is three-story tall, the interface is not on the surface. You turn around the box and pay attention to the locked metal cover on the back - open it! There are two areas:

• ​​Control card holder​​: A USB 3.0 interface is hidden, with a lightning symbol marked next to it
• ​​Power bank​​: Don't touch the wrong place, there are only thick cables here
  There is a trick: the magnetic access cover is probably a portal for the USB flash drive. When Tokyo installed a curved screen last year, workers taught customers to use mobile phone compass to find interfaces. Do you think it will never stop?

​​2. Transparent video wall: Invisible design on the side​​
The transparent screen with a 86% transmissiveness is the most invisible:

• Touch 5cm back on the left side, there is a recessed slot
• Only by pushing open the dust cover can you see the Type-C interface
• With breathing light prompt, blue light will flash when inserted in the right place
  Remember, the USB port of this kind of screen is more delicate than the charging port of the mobile phone. It is plugged up and down and is tilted and it is accurate!

​​3. "Quick Disassembly Secret of Rental Screen"​​
The aluminum-magnesium-zinc alloy box looks naked? The person's interface is:

• Inside the top snap position
• Flip cover with spring protection
• Support hot plugging, and the content changes in the performance midfield will not be black.
  Last month's Seoul concert, the stage director relied on this design and changed three visual solutions in 15 minutes.

2. The technical parameters

​​1920Hz refresh rate + USB3.1=? ​ ​
There are many considerations to put these two parameters together:

• 4K videos are 3 times faster than normal screens
• Supports reverse power supply, USB drive does not need external power supply
• You can adjust the brightness when plugged in with a USB flash drive, and switch from 800 to 7500 nits at will.
  Tested data: Using the right interface, outdoor screen video can save 30% of power and extend its life span for two years!

​​Hidden skills for IP65 protection​​
The USB port of the waterproof screen is not a decoration:

• Three-layer silicone sealing ring
• Self-draining diversion tank
• Anti-failure plug design
  I remember that last year, the screen in a shopping mall in Southeast Asia was soaked in water for three days, and pulled it out and shook it as usual. Isn’t it?

3. A must-read practical guide for beginners

​​Five plots of inserting USB drive:​​

1. Turn off the screen and power off (important! )
2. Find an interface with the "↑↓" arrow
3. Confirm the interface type (port A/port C)
4. Hearing a "click" sound when you insert it
5. Wait for 3 seconds to turn green

​​Eight major actions:​​

• Plug and unplug with electric (no discussion on burning the chip)
• The USB drive is formatted to exFAT (can't recognize it! )
• Pass videos that exceed the interface speed (will get stuck in PPT)
• Use inferior extension cord (signal attenuation starting from 50%)
• Long-term insertion and unplugging (shortening the interface life)
• Mixed control software for different brands (system conflicts)
• Ignore firmware upgrades (new USB drives may not recognize them)
• Don't check the seal during rainy season (wait for a short circuit)

4. Self-question and self-answer session

​​Q: Why didn’t my USB flash drive react? ​ ​
Eighty percent of it is a file system problem! The LED screen recognizes FAT32 and NTFS, so format the USB drive as soon as possible. If it doesn't work, try converting the video to H.264 encoding, and the code rate does not exceed the upper limit of the interface.

​​Q: Can I change the content of the USB flash drive while broadcasting? ​ ​
It depends on the specific model! A screen with cache function is OK, but playing with ordinary screens will cause black screen for 3-5 seconds. To be safe, it is better to wait until the current content is broadcast before operating.

​​Q: What should I do if the interface is oxidized? ​ ​
Don't sand with sandpaper! Take a cotton swab dip it in anhydrous alcohol and wipe it gently along the groove pattern. If the oxidation is severe, buy an antioxidant spray once a month to maintain it.

If I ask me, finding an interface is like falling in love - you have to understand its "temperament". Last week, I went to inspect the stadium fence screen and found an interface hidden in the LED light bead array. I had to touch the control panel in a specific order before popping up. Although this design is safe, it is a pity for novices. So, next time I encounter a situation where I can’t find North, remember three keywords:​ ​Structural drawings, breathing lamps, anti-dust design​​. Keep it safe and avoid detours and reach your goal directly!

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