You must have encountered this situation - the newly purchased LED screen is obviously powered on, but the signal input port cannot be found. When installing advertising screens in shopping malls last year, I personally saw the installation master holding the screen and turning it around for half an hour, and finally found that the interface was hidden in the groove of the frame. Today we broke it apart and crushed it into pieces to talk about,​ ​What are the secrets of these interfaces hidden in nooks and crannies?​​。

​​Common interface types​​

There are currently four mainstream interfaces:

1. ​​HDMI port​ ​: Looks like a trapezoidal lunch box, transmitting 4K signals most reliably
2. ​​Network port​ ​: The square shape has a buckle, and you can rely on it to control the multi-screen play.
3. ​​Power port​ ​: Usually three or five pins, be careful not to reverse the positive and negative poles.
4. ​​Debug port​ ​: Mini USB or Type-C, a life-saving channel for engineers

Focus on this! Nowadays, high-end screens are starting to be used​ ​Magnetic interface​ ​. Last week I saw a ruthless guy. The power cord clicked when it was close to the interface. Not only does it require less effort than the traditional plug-in type, but it also prevents accidental contact. An actual measurement of a mobile screen in a shopping mall showed that the wiring speed was three times faster when changing venues.

​​The interface locations are regular​​

Although the screen is square and square, the hiding place of the interface is very particular:

• Outdoor advertising screen:​ ​Bottom waterproof cabin​ ​Inside (with rubber stopper)
• Transparent screen:​ ​Slotted side frame​ ​(Thickness≤3cm)
• Rental screen:​ ​Quick release plate on the side of the box​ ​later
• Floor tile screen:​ ​four corner collision zone​ ​internal

There is a counter-intuitive design——​ ​Dual-sided interface​ ​. The ring-shaped screen installed in a theater last year can be connected to signal lines at the front and back. When the stage changes scenes, technicians do not have to drill behind the screen to make connections, which is trouble-free and safe. This design is becoming more and more common now, especially curved screens and special-shaped screens.

​​Guide to preventing pitfalls online​​

Let me tell you a lesson learned through blood and tears: There was a 10-meter-long LED wall at last year's exhibition. Because of the use of inferior network cables, the screen always flashed with snowflakes. Later, it was replaced by Hermès in the online line.——​ ​Category 6e shielded wire​ ​, it immediately seemed like I had used beauty.

Here is a parameter to fight with:​ ​Interface refresh rate​ ​. The HDMI port of a good screen can run to 1920Hz, but the poor product is marked with a 4K port and can actually only support 30Hz. Let me teach you a trick - shake the mouse arrow quickly. If there is a smear in the trajectory, then the performance of this interface is definitely watered down.

​​Question and answer time​​

​​Q: What should I do if the interface is loose and has poor contact? ​ ​
Don't rush to curse yet! Try using a cotton swab dipped in alcohol to rub the gold finger, 80% of the time it can be resolved. If it still doesn't work, check to see if the interface is available​ ​Self-locking design​ ​, the ones with buckles are much more reliable than the plug-in ones. The coolest design I've ever seen is one with thread locking. Once it's screwed on, it won't even open in an earthquake.

​​Q: Is the outdoor screen interface afraid of rain? ​ ​
Have to see​ ​Protection level​ ​! The IP65 interface compartment can still be operated in rainy days, but you should pay attention to whether the rubber sealing ring has aged. A screen at a construction site was damaged here - the cover of the interface compartment was not fastened tightly, and the control card was short-circuited and burned after the rain.

​​Q: If the interface is not enough, can I add it myself? ​ ​
Never connect the splitter randomly! The professional approach is to install​ ​signal distributor​ ​, or directly ask the manufacturer for a receiving card with an expansion port. There was a shopping mall event last year, and I had to use a splitter to connect 8 signals. As a result, the screen delay was 0.5 seconds different, and the host's mouth shape and voice were completely mismatched.

To be honest, looking for interfaces is like playing hide and seek. Recently I came across a new product from a Shenzhen company. The interface actually has a breathing light prompt - it lights up blue when powered on, flashes white when transmitting data, and turns red when there is a fault. This design is so friendly to novices. There is no need to use a mobile phone flashlight to look for the interface. Remember,​ ​The interface of a good screen must be ergonomic​ ​, this product can only be connected while standing on tiptoes, so don’t think about it before it’s too late!

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