Are you bosses driven crazy by this USB interface recently? Last month, a friend who owns a hotpot restaurant bought a new display but couldn't find the USB port. He was so anxious that he almost dismantled the screen and used it as a cutting board. Today we will break it up and talk about it. I guarantee that you will slap your thigh after watching it: "It turns out to be so simple!" "

1. Can’t find the USB port? Mostly these places

Let me tell you a real story first: Last year, a shopping mall held an anniversary celebration. When debugging a large screen on site, five technicians circled around the machine and couldn't find the USB interface for half an hour. Finally found hidden in​ ​In the flip cover on the right side of the power module​ ​, don’t you think it’s annoying? In fact, finding an interface is like playing hide and seek. You have to figure out these routines:

1. ​​Side hidden compartment​ ​: 60% of models are hidden in dust covers on the left and right sides
2. ​​groove on back​ ​: 30% of machines have built-in design (you have to reach out to touch it)
3. ​​Inside the control box​ ​: For models with external processors, the interface may be on the black box

To give a real example, the waterproof screen made for Southeast Asia is even more amazing - the USB port is actually hidden in​ ​In the sliding cover under the heat dissipation vent​ ​! You have to dig it open with your fingernails to see it. This design is really waterproof.

2. No response after inserting the USB flash drive? 80% of them have stepped on these pitfalls

Last week, I helped a gym owner solve a strange problem: the USB flash drive could charge but could not read the data. And guess what? The display he bought​ ​The USB port only supplies power but does not transmit data​ ​! This matter reminds us:

​​Look for the three interface identifiers​​：

• With SS mark (fastest)
• Drawing a gear icon (can be refreshed)
• Marked "5V/2A" (pure power supply port)

Here is a parameter comparison table that you need to keep:

If you see a merchant labeling "Enhanced USB", remember to ask if it is version 3.0 or above. Just like buying a mobile phone without asking about the running memory, aren't you waiting to be deceived?

3. The doorway behind the interface location

Do you know why some USB ports are designed to be so anti-human? The floor tile screen made for a music festival last year gave the answer——​ ​Design forced by IP65 protection requirements​ ​! The interface of such a machine must be hidden in three layers of protection:

1. Rubber seal (dustproof)
2. Stainless steel buckle (anti-tear)
3. Waterproof rubber stopper (anti-splash)

The most exaggerated thing is the stadium fence screen. If you want to insert a USB flash drive, you have to unscrew two screws! However, this design does work. For a machine that has experienced the test of typhoon and heavy rain, there is no moisture at all when the interface is disassembled.

4. Expansion cheats giveaway

If you are unable to find the interface, try these three tricks:

1. Find it along the power cord (80% of the interfaces are near the power supply module)
2. Feel all the concave and convex places (some hidden designs are invisible to the naked eye)
3. Check the control menu (some models need to turn on the USB function in the settings)

I handled a theater project last year and it was even more amazing - their control interface actually required​ ​Press and hold the Menu key + Power key simultaneously for 5 seconds​ ​It will pop up! This design is probably to prevent accidental touch, but it can make the on-site technician break into a sweat.

The editor says something from the bottom of my heart

After working in display screens for more than ten years, I have seen too many cases where the interface drove me crazy. Last year, a customer insisted on using the HDMI port as USB, and the motherboard burned. If you want me to say,​ ​When buying a screen, be sure to ask the seller for the SD interface diagram.​ ​! Just like looking at the floor plan when buying a house, this is a basic right of consumers.

Next time you encounter interface problems, remember this universal formula:
"Touch, find, and take photos. Video guidance is the most reliable."
Many manufacturers now provide AR remote guidance. The camera scans the machine, and engineers can directly mark the interface location on the screen. This technology really saves the trouble!

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