"It was said that the video could be played by plugging in the USB flash drive. I turned around the screen five times and couldn't find it! "Last month, boss Li of the hot pot restaurant made me laugh and cry. Industry research shows that nearly 40% of LED screen usage inquiries are stuck in the first step of finding an interface. Today we will take a "magnifying glass" to understand this matter.

Regular position big bottom

​​Box type fixed screen​​：
▪ ​​Behind the Velcro in the lower right corner​ ​: Open the dust cover and you will see 2-4 USB 3.0 interfaces (blue tongue)
▪ ​​Control box side groove​ ​: With rubber stopper protection, be careful not to fall into the box gap when picking with your fingernails.
▪ ​​Hidden push-pull design​ ​: Use a coin to slide in the direction of the arrow. This is more common in waterproof outdoor models.

​​Rental screen/mobile screen​​：
▸ Inside the quick release bracket (you have to tilt the screen 45 degrees to see it)
▸ The back of the magnetic receiving card (easily confused with the signal interface)
▸ Important reminder: Most of these interfaces support hot swapping, but do not unplug the cable randomly during playback.

​​Transparent screen/special-shaped screen​​：
→ Distributed design, each unit box has independent interface
→ The main control box has a Type-C port with a gold logo (compatible with USB adapter)
→ Trivia: Some high-end models require two USB flash drives to be inserted at the same time to be recognized.

Three truths that cannot be found

​​① The protective design is too hidden​​

• The USB port of the outdoor screen is hidden in the waterproof compartment (you need to rotate the hatch cover counterclockwise)
• Here’s a trick: follow the power cords, usually no more than 30cm apart.

​​② Wrong interface type​​
→ What looks like USB may be:

1. 232 control port (9-pin D-type head)
2. Gigabit network port (with buckle)
3. Optical fiber input port (with red protective cap)

​​③ System version causing trouble​​
▪ Old screens before 2016 need to be plugged in in a specific order: first turn on the screen → insert the USB flash drive → power on
▪ When encountering recognition failure, try formatting the USB disk into FAT32 (NTFS format is not recognized)

Interface usage pit avoidance manual

​​Plug and unplug metaphysics​​：
→ Do not pull out hard during file transfer (it is easy to burn the control chip, and the repair fee starts at 500 yuan)
→ First click "Safe Eject" on the screen and then unplug the cable (although there is no prompt like the computer)

​​format war​​：

​​capacity myth​​：

• Older control cards can accept up to 32GB (don’t be greedy when buying a USB flash drive)
• Best choice: industrial-grade USB flash drive with metal casing (3 times more durable than ordinary models)

Soul questions

​​Q: Can the screen be turned off with a USB flash drive inserted? ​ ​
→ It is recommended to unplug the cable first and then shut down the phone, especially when using the docking station
→ A sudden power outage may cause the file index to be lost (it must be re-imported)

​​Q: How to deal with rusty interfaces? ​ ​

1. Spray with precision appliance cleaner (don’t use WD-40! )
2. Use a toothbrush dipped in alcohol to lightly brush the contacts
3. Allow to dry thoroughly for 12 hours before powering on

​​Q: Can I install a USB port myself? ​ ​
→ You need to buy an expansion module with a protocol chip (30 yuan on Taobao is easy to burn the motherboard)
→ The openings in the box must use waterproof connectors (dust entering will cause a short circuit)

​​Editor's opinion​ ​: The most outrageous case I saw last year - a businessman used a wire to poke the USB port and the control card was penetrated. The repair cost 2800. To be honest, it’s not a shame to not be able to find the interface. Nowadays, some high-end screens hide the interface behind the magnetic panel. Even the masters have to look for it for a long time. Remember, when you encounter a situation that you really can't figure out, it's much more worry-free to shoot a video and ask after-sales service than to mess around. After all, professional things need to be done by professional people.

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