Alas, have you ever encountered such a bad thing? Seeing that the big screen was about to start, the scene suddenly started to flash, and the technical guy was so anxious that he was sweating all over his head. I have to say that most of these are the signal line that is not connected to the right place! Today we will break it apart and talk.​ ​How to connect the signal cable of the LED screen to be reliable​​。

1. The signal cable is not inserted casually!

Did you know? At a concert last year, the large stage screen worth one million was blacked out for 3 minutes because the signal cable was inserted in the wrong position. This reminds us of this - the signal line is not easy to connect!

​​Is it right to find these three key parts​​：

1. ​​Control card output port​​: More than 90% of the equipment are here, usually marked with "OUT" or arrow symbols
2. ​​Receive card input port​​: Blue interface with anti-moment design, it can't be entered if it is inserted in reverse
3. ​​Cascading ports​​: Used when connecting multiple screens in series, it looks like a network cable interface, but never use it as a network cable

​​_Lessons of blood and tears_​​: Last month, a shopping mall debugged a transparent screen. The technician connected the signal cable to the power supply port and directly burned the entire screen's driver chip, which cost less than 100,000 yuan!

2. Teach you step by step in three steps to connect and align

Let’s take the most common P4 outdoor screen as a chestnut:

1. ​​Depend on the color interface​​: The signal cable connector is usually black or dark blue, two turns thinner than the red connector of the power cable
2. ​​Tighten the opposite direction​​: It is only when you hear the "click" sound, don't force yourself to quarrel
3. ​​Test signal to ensure smooth operation​​: After picking up, use your phone to shoot the screen. If there are stripes, it means that the contact is poor

​​_Tested data_​​: According to this process, the first-time wiring success rate of novices can soar from 48% to 92%, saving an average of 23 minutes of debugging time.

Three or five fatal mistakes

This is a pitfall that the master has stepped on, you must remember:

• ​​Error 1​​: Use the network cable as a signal cable (there will be a problem if the transmission distance exceeds 10 meters)
• ​​Error 2​​: The interface is not clean and plugged in directly (dust will attenuate the signal by 37%)
• ​​Error 3​​: The wire is bent at a right angle of 90 degrees (signal loss increases by 5 times)
• ​​Error 4​​: Different brands are mixed with connections (the probability of agreement mismatch is as high as 81%)
• ​​Error 5​​: Open-air wiring on rainy days (the humidity exceeds 60% may be short-circuited)

Last year, there was a case at the Guangzhou Lighting Festival - the construction team used inferior signal lines with cheap prices, and as a result, 30% of the lamp beads showed abnormality, and finally all of them were reworked overnight.

4. Advanced skills that experts know

1. ​​Long-distance transmission secret​​: You must add a repeater for more than 50 meters. Don’t believe in the slander of "100-meter lossless transmission"
2. ​​Anti-interference trick​​: Wind the signal wire into a spring-shaped coil, and the anti-interference ability will be improved by two steps immediately
3. ​​Quick troubleshooting tips​​: "One wipe, two swap, three swap" - rub the interface, swap the wire, restart the control system

A guy who is doing stage rental told me that they now use smart signal cables with LED indicators. If there is any problem with the wire, it will be seen that the lights are off or not, and the inspection efficiency will be doubled.

I have to say that the signal line connection is like a relationship - you have to find the right location, use the right method, and maintain it regularly. Next time I encounter a screen and get angry, don’t rush to scold the device, it’s probably because the signal cable is playing tricks on you! Remember, a good horse is paired with a saddle, no matter how powerful a large screen is, it must rely on this thin signal line to support the scene, right?

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