Have you ever had a three-way experience of holding a U-coil screen while in a mall event? Last month, I debugged the LED screen for my friend's company. I took the USB flash drive and searched for the interface for half an hour. Finally, I found that the socket was hidden in the dark grid of the screen border - I can remember this embarrassing thing for the rest of my life! Today I will teach you step by step to crack the metaphysics of this industry.

Interface Hidden Cat Competition Champion

Different models of LED screens have made a variety of interfaces:
​​▸ Entry-level box screen​: The interface is in the groove at the bottom, but nine out of ten newcomers will miss the dust plug
​​▸ High-end curved screen​: The interface is hidden on the side and the hidden compartment must be pressed to pop up.
​​▸ Rental quick disassembly screen​: The interface is actually at the back maintenance port, and you have to disassemble two modules to see it

Once at the press conference, I saw a technical guy using a strong light flashlight to scan the screen border. It turned out that he was looking for a certain brand.​Borderless screenmagnetic interface. This design is like Apple's hidden SIM card slot - knowing the method can be done in three seconds, and those who don't know can sweat.

Three major positioning tools test

After more than a dozen crazy experiences, I summarized this methodology:

1. ​​Mobile flashlight sweeping method​
   Light along the 45-degree angle of the screen border, paying special attention to the location of small grooves or color differences. Last time I used this trick at the exhibition center, I found the Type-C interface covered by spray paint in 5 minutes.

2. ​​Manufacturer’s Instruction Treasure Picture​​
   Although they are all electronic now, asking the manufacturer to ask for an interface location diagram to save trouble. A brand marked the exact coordinates "38cm from the left edge" in the instruction manual, and the actual measurement error is less than 2mm.

3. ​​System menu Counter-reconnaissance​
   In the advanced settings interface, find the "external device" option, and some smart screens will display the physical location of the interface. Once, the debugging site was prompted by "Please check the 2nd interface of Block 3" and directly lock the target area.

Lessons of bloody tears when inserting the wrong hole

Finding the interface is just the beginning. I advise you not to step on these pitfalls:

• ​​Recognize USB3.0 blue tongue​: The unlucky guy who plugged into the HDMI port and burned two control cards here
• ​​Don't throw dust plugs around​: The screen in a shopping mall was reduced by 50% due to the dust in the interface.
• ​​File format to be converted​: The most common situations - 4K videos on the USB flash drive cannot be broadcast, and it will be solved immediately after switching to MP4.

There is a real case: the main stage screen of the music festival last year went on strike, and finally it was discovered that the staff inserted the USB flash drive into the firmware upgrade interface. This error directly leads to a delay in activity by 1 hour and a loss of at least five digits.

Exclusive data reveal

Industry surveys in 2023 show:

• 72% of LED screen debugging delays are related to interface positioning
• Use NTFS format USB disk to save 30 minutes of transmission time than FAT32
• The interface with indicator light has a failure rate of 67% lower than that of ordinary models

A friend who is engaged in technology secretly told me that some manufacturers are now developing sound wave positioning function - when the USB flash drive is close to the interface, it will emit a prompt sound. I'm going to say that this function should have been released long ago, after all, in this wireless era, people still find physical interfaces, which is really a bit of black humor.

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