Do newbies who are new to LED displays often hold up USB flash drives to look for interfaces? Just like the first time I can't find the headphone jack with a smartphone, this seemingly simple question hides great knowledge. Today we will break it apart and explain it clearly, so that you will no longer be a "interface touching hero"!

​​# Why can't your USB drive be plugged in? ​ ​
Last month, a shopping mall had a large screen because interns plugged in USB flash drives and directly burned the receiving card, which cost less than 20,000 yuan. ​ ​This is the key point​​：

• ​​Interface type​ ​: Nowadays, mainstream displays use HDMI or USB-B type ports, so don't use the mobile phone Type-C to force it
• ​​Voltage difference​ ​: Control card power supply port 5V, power interface 220V, blue smoke will be emitted directly if plugged in wrong
• ​​Protective design​ ​: The outdoor screen interface has a waterproof glue plug, you must first open the protective cover before inserting it

​​# The location of the three hidden interfaces is revealed​​
There is a cold knowledge - the interface of the high-end rental screen is hidden in the box buckle, so it is not easy to damage during handling. ​ ​Common location comparison table​​：

​​# The correct posture for plugging in a USB drive​​
Last year, there was a black screen accident at a concert with a large screen, and it was later confirmed that it was a bad contact with the USB flash drive. ​ ​Remember these three steps to ensure safety​​：

1. ​​Power off operation​ ​: Turn off the power supply first and then plug it out. The chip will be burned easily when operating with live
2. ​​Direction confirmation​ ​: The USB port has a dumb-proof design. Don't be hard if you can't insert it.
3. ​​File format​ ​: FAT32 format is the safest, don't use exFAT for 4K videos

​​# Interface selection for different scenarios​​
Those who engage in outdoor advertising must choose an air interface with IP65 protection, which can be played as usual in rainy days. ； It is best to use a quick-release interface on the stage screen, changing videos is faster than changing performance costumes ； The shopping mall window screen must be made of a hidden interface, which is both beautiful and safe. To be honest, I have seen too many people insert USB flash drives on outdoor screens for a long time, and the interface oxidation leads to disordered signal on the entire screen.

​​# Emergency First Aid Guide​​
Q: What should I do if the screen flashes when the screen is inserted after plugging in the USB flash drive?
A: Immediately execute the "three checks" - check the USB disk format, check the file encoding, and check the interface oxidation. There is a tough trick: try reducing the video resolution to 1920x1080

Q: Will dust entering the interface affect use?
​​Emergency Plan​​：

• Purge with compressed air tank
• Wipe cotton swab dipped in electronic cleaner
• Use plastic toothpicks to remove stubborn stains

​​Editor's opinion​ ​: I recently discovered an interesting phenomenon. The higher the display screen, the more hidden the interface is. This is like the fuel tank cover design of a luxury car, which must be both convenient to use and maintain its beauty. By the way, I heard that the latest screen can be used to transmit files wirelessly using mobile APP. Do you think the USB drive interface will be eliminated? If you want me to tell, it is the most reliable to plug in wires in a critical situation!

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