Hey, have all novices who just bought LED screens encountered this kind of crazy moment? Last week, I helped a friend install a store advertising screen. Three old men gathered around the computer host for half an hour to find the interface - "This hole can't be inserted!" ""Is this wire mismatched? "Finally, I found that the control card was not powered on at all... Today we will break it apart and crush it to talk about how to connect the LED screen control line to the computer.

Understand the basic configuration first

Before talking about control lines, you must understand that the entire system actually has three pieces:

1. ​​LED display body​ ​(That’s the big thing hanging on the wall)
2. ​​control card​ ​(brain equivalent of screen)
3. ​​computer​ ​(Commander responsible for sending orders)

There is a little girl who runs a milk tea shop. She plugs the control cable directly into the USB port of her computer, but the screen does not light up. Later I found out that her control card needed a network port to transmit data. So,​ ​It is more important to look at the control card type first than to find the interface.​​。

Interface type matching

There are four common interfaces on the market. Let’s explain them in plain language:

Last week when I was installing a physical measurement data screen in a gym, I encountered a strange thing - the control card was obviously for network port transmission, but the boss insisted on connecting it to HDMI, resulting in serious image smearing. Later, I changed the network port cable with a fiber optic converter, and the display screen 60 meters away still displayed smoothly.

The painful lesson of connecting the wrong interface

Let me tell you a few real cases to remind everyone:

1. The hardware store owner forced the VGA cable into the DVI port and bent three of the pins. The repair cost 500 yuan.
2. The USB extension cable used in the supermarket exceeds 20 meters, causing the control signal to be delayed. The price list is always half a beat slower than the system.
3. The most outrageous thing is that the wedding company used a mobile phone charging cable as a control cable and burned out three control cards.

In fact, most high-end control cards now support multiple interfaces. For example, a smart control card I have come across can connect HDMI and network cables at the same time and automatically select the optimal signal source. Although this equipment is more expensive, it is worry-free!

Five steps to get connected

1. ​​Power outage! Power outage! Power outage! ​ ​(Say important things three times)
2. Confirm that the power supply of the control card is normal (many faults are caused by the power supply not being plugged in tightly)
3. Install the control software on the computer (do not use pirated software, as you will lose the driver)
4. Prefer digital interface (HDMI/DP is twice as good as VGA)
5. Unplug other external devices before testing (especially old computers are prone to insufficient USB power supply)

There was a clothing store owner who always unplugged the power cord every time she turned off her computer. As a result, the control card memory chip burned three times. Later, I taught her to click "Safe Disconnect" in the software first, and there was no problem again.

Editor’s hardcore advice

1. ​​Don’t be cheap when buying wires​ ​: 9.9 The free shipping HDMI cable may only have 19 cores, so you need to buy at least 28 cores of all-copper cable.
2. ​​Interface oxidation treatment​ ​: Remember to spray anti-rust agent on the interface for outdoor use (a bottle costs 8 yuan at the hardware store and can be used for two years)
3. ​​Rooted adapter cable​ ​: Type-C to HDMI cables are now more and more commonly used

Recently, I have seen that some manufacturers have developed wireless control cards that can directly adjust the screen of a mobile phone. However, according to actual measurements, screens within 20 square meters are okay, and large screens are still practical and reliable with network cables. After all,​ ​Choosing the right interface is only the first step, stable transmission is the last word​ ​, those control systems that can automatically repair signal interruptions are really cool!

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