I just bought a LED display, but I can't find the interface if I plug in a USB flash drive to pass files? This matter has made many novice novices very anxious. My friend installed a shopping mall advertising screen last month. When debugging, he held the USB and coiled it around the screen for five times - who would have thought that the USB port was actually hidden in the side card slot? Today, let’s take a look at this seemingly simple but has driven many people crazy, and by the way, how to quickly get started with digital devices such as LED displays. (Writefully, there are hidden skills at the end of the article, and you can save half an hour of exploration after reading it)

1. First understand what the USB port is for

Many newbies only care about finding the power cord when they get the LED screen. In fact, the USB interface is the real "master key". This thing can do three major things:

1. ​​Passing files faster than Bluetooth​​: You can update the ad content without disassembling the screen, which is 10 times faster than sending pictures on your mobile phone
2. ​​Firmware upgrades are not blind​​: Don’t panic when encountering black screen splashing. It’s faster to plug in the USB flash system than to find after-sales service.
3. ​​Temporary power supply expert​​: Some control cards require additional power supply, and the USB port can be used as an emergency power supply.

However, it should be noted that the interface positions of different models are far different. Once I helped someone install a stage floor tiled screen, and the USB port was actually designed in the splicing seam. You have to use your fingernails to open the protective cover to see it.

2. Revealing common hiding positions

According to my experience of dismantling more than 200 screens, the USB port is generally hidden in three places:

​​Position 1: Border Magic Zone​​

• Look at the frames around the screen, focus on checking the lower right corner (70% of the models are placed here)
• Some designs with flip covers need to be gently pried open with fingernails
• Pay special attention to waterproof glue plugs on the outdoor screen. Don’t pull it hard and it will break the seal strip.

​​Position 2: Back plate maze​​

• Turn to the back to find the trapezoidal interface with the word "USB"
• The commonly used recessed design of engineering screens should be used to search with a flashlight
• When encountering an interface with a lock, do not use brute force, follow the instructions to unlock it first.

​​Position 3: Side Invisibility​​

• Narrow-frame models like to use this trick, the interface is hidden in the groove on the side of the screen
• Rental screens are usually not blocked for easy plugging and unplugging.
• If you encounter a stuck one, don't use a paper clip, dip the cotton swab in alcohol to wipe the interface.

I saw the most amazing design - the USB port is actually made into a connected structure with the power interface, and you have to unplug the power cord before you can see it. The manufacturer's idea is really difficult for us to install screens.

3. What should I do if I can’t find it?

Last week, a gym owner was so anxious that he couldn't find a USB port when he bought the newly-built interactive floor tiles. Later I found out that the new model in 2023 uses the Type-C interface and needs to be equipped with an adapter. Don’t panic when encountering this situation, follow these three steps:

​​Step 1: Confirm the model version​​

• Previous 2018 old models use square USB-A port
• After 2020, high-end models will start to use flat Type-C
• The latest transparent screen may integrate interfaces into control systems

​​Step 2: Check the instructions and don't be lazy​​

• Go to the "Interface Description" chapter, focus on the illustrations and notes
• Note that the English label "USB" may be written as "UCB" (don't laugh, I've seen it)
• Search keywords with Ctrl+F for electronic version manual

​​Step 3: The Ultimate Killer​​

• Find a magnet to move slowly on the frame (the metal interface will have suction force)
• Use the mobile phone camera to turn on the flash to shoot video, the reflective point may be the interface
• If you really can't find it, call after-sales service. Remember to take pictures of the body code

I remember one time when I helped the customer install a stadium fence screen, six technicians searched for two hours but couldn't find the interface. Finally, I found that the manufacturer forgot to punch holes and the USB port was sealed on the internal circuit board - this strange situation would have to be returned to the factory directly.

4. Interface type hidden mystery

Although they are all USB ports, different shapes are different:

Recently, I discovered a strange phenomenon: some manufacturers have made the interface into a spring door structure in order to waterproof, but after using a long time, the spring has rust, so they have to pry it open with a screwdriver. This kind of anti-human design is really... (Three hundred words of complaint are omitted here)

Editor's opinion

To be honest, looking for a USB port is like playing escape room. If you encounter it again next time, take a deep breath and slowly touch it along the border. If you really can’t find it, don’t compete with yourself. Just take a photo of the body number and ask for after-sales service. After all, some new models hide the interface more concealed than the private money in the wallet for the sake of beauty. By the way, I heard that the latest LED screens have begun to replace USB with wireless transmission? Let's talk about this next time...

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