​​Hey, friends! The topic we are going to talk about today is too real - when you hold the USB flash drive and worry about the LED advertising screen, do you think this interface is like playing hide-and-seek?​​
Last week, I saw the mall guy turn around the screen with his own eyes for three times but couldn't find the socket. Finally, I found that the interface was hidden in the waterproof cover behind the display screen. This kind of embarrassing thing actually happens every day. Today I will teach you how to break the deadlock quickly!

1. Three major hiding places for interface location

​1. Near the control card: the engineer's thoughtful design​
More than 90% of LED advertising screens will hide the USB port next to the control card. This thing is usually an iron box the size of a palm, and its location is:

• ​​Wireless screen advertising machine​: 90% on the inside of the lower right corner of the screen
• ​​Horizontal screen large screen​​: 70% in the groove of the bottom middle frame (you can touch it with your hand)
• ​Special styling screen​: For example, the arc screen may be in the maintenance door at the splicing

​​Please give a chestnut​​: Last year, the P3 advertising screen interface of a shopping mall was hidden behind a LOGO sign. I found that I had to lift the dust cover during maintenance. So, when you encounter a special screen, it is absolutely right to find a movable cover first!

2. Determine the appearance of the interface: Don’t treat the network port as a USB

Now there are so many interfaces on the LED screen that can force you to make the choice difficult. I will teach you three ways to quickly identify them:

1. ​​Look at icons​: The power port with the trident symbol (⚡) is the power port, the "↑↓" arrow is the signal port, and the classic USB logo is the
2. ​​Measure size​​：
   • Type-A interface (common U disk port): 12mm×4.5mm rectangle
   • Type-C interface (new device): 8.4mm×2.6mm oval
3. ​Touch texture​: The waterproof interface of the outdoor screen will have a rubber sealing ring. When inserting and unplugging, you need to first open the protective cover.

​​Note​! Don't use the RS232 serial port as a USB port. These two look like twins but have very different functions. The serial port is usually arranged in a 9-pin trapezoidal shape, and if it is inserted incorrectly, the equipment may be burned!

3. Is there no response after plugging in the USB flash drive? Five Life-Saving Guide

​​Are you crazy? Don't worry, let's check it step by step​

1. ​Check the voltage​: Use multimeter volume interface voltage (normal value 5V±0.5V), and may not be able to move the USB drive below 4.5V
2. ​​Look at the format​: Format the USB drive into FAT32 format, and the NTFS format is probably not read
3. ​​Switch interfaces​: If there are multiple USB ports on the screen, preferential power supply port with lightning icon
4. ​Clear cache​: Press and hold the screen menu button for 5 seconds to reset the system, which is equivalent to "restarting the brain" on the screen
5. ​The ultimate solution​: Prepare a USB extension cable to lead the interface to a convenient location

​​Real cases​: Last year, the advertising screen of a pedestrian street in Shenzhen caused the interface to oxidize due to the humidity in the rainy season. After wiping it with an alcohol cotton pad, it immediately returned to normal. Therefore, regular maintenance of the interface is very important!

4. Hidden gameplay of new devices

Now the interface of high-end LED screens is more than just transmitting data:

• ​Dual system switching​: Plug a specific USB drive to enter the engineering mode to adjust the color temperature
• ​Firmware upgrade​: Name the upgrade package "FW_UPDATE.BIN" and insert it into the bottom interface
• ​Multi-screen interaction​: Use OTG cable to connect the mobile phone and directly cast the live broadcast screen to the large screen

However, I would like to remind you: these advanced functions require professional and technical personnel to operate. Don’t try it out!

Personal opinion time

After working in display screen operation and maintenance for more than ten years, I found80% of interface problems are improper human operation​. Suggest everyone:

1. Use cotton swabs to clean the dust from the interface every month (don’t use metal objects!)
2. Try to choose a brand product with indicator lights for USB flash drives, and the reading and writing status is clear at a glance
3. Always make double backups of important content, don't put eggs in a basket

Next time, if you cannot find the interface, remember this formula: "First find the control card, then touch the border, look at the cover plate for special shapes." Once you master these skills, you will be more efficient than professional operation and maintenance!

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