Are newcomers who have just taken over the LED large screen often go crazy? The computer was obviously connected, but no content was displayed on the screen. I was so anxious that I was sweating. Last week, a mall administrator was even more outrageous - he accidentally touched a certain setting, and the entire promotion advertisement turned into snowflakes all over the screen, and he was scolded by the boss. Today we will break it down and understand this:​ ​How does a computer control a large LED screen?​ ​Wouldn't the car roll over?

Control principle: Don’t be confused by cables

First of all, we need to understand that there are currently two mainstream control methods:​ ​Wired connection​ ​and​ ​wireless transmission​ ​. Commonly used wired ones are HDMI or network cables, while wireless ones are through WiFi/5G. There is a pitfall to be aware of here: many novices think that they can be used just by plugging in a cable, but in fact they need to get these two things:

1. ​​Send card​ ​(hardware installed on the computer)
2. ​​receiving card​ ​(Components embedded in the LED screen)

Let’s take a real case: A supermarket changed to a new computer, and the sending card of the old machine was directly removed and used. As a result, the resolution did not match and the screen was directly torn. So remember:​ ​The sending card and receiving card must be used together​ ​, just like the mobile phone charger cannot be plugged in randomly.

Hardware Connection Pitfall Guide

​​Essential equipment list​​：

• A computer with an independent graphics card (core graphics cannot support a large screen)
• Matching sending card (select the model based on the screen area)
• Gigabit network cable (don’t be cheap and buy 100M)
• Backup power supply (to prevent sudden power outage and card burning)

Never reverse the connection order:

1. Turn off the computer power → insert the sending card → connect the network cable
2. Turn on the LED screen power → wait for the receiving card indicator light to turn green
3. Finally start the computer

Last year, there was an embarrassment on the opening day of a hot pot restaurant because the electrician turned on the computer first. As a result, the voltage was unstable and burned the sending card, which delayed the sales for three hours. A bloody lesson!

Software settings three important gates

Now comes the point! After installing the control software, these three settings must be checked:

​​1. Resolution matching​​
The computer resolution must be equal to or lower than the physical resolution of the LED screen. For example, if the screen is 3840x2160, it will be smoother if the computer is set to 1920x1080. There is a quick detection method: click "Smart Adaptation" in the software to automatically generate the best parameters.

​​2. Refresh rate synchronization​​
Ever seen a screen flickering like an old TV? That's because the refresh rate is not adjusted correctly. High-end screens now support a 1920Hz refresh rate, but it has to be turned on manually in the graphics card settings. Here’s a trick: set it to 80% of the screen’s maximum refresh rate for the most stable performance.

​​3. Color space conversion​​
The LED screen uses RGB mode, while the computer defaults to sRGB. If you don't convert, the red will appear orange! In the color management of the control software, remember to check​ ​Gamma 2.2 correction​ ​, so that the color is accurate.

Frequently Asked Questions Self-Help Manual

​​Q: Why can’t the computer detect the LED screen? ​ ​
A: Check these three points first:

1. Have you installed the sending card driver? (Check if there is an exclamation mark in the device manager)
2. Which port of the receiving card is the network cable plugged into? (To be connected to the interface with "IN" logo)
3. Is there an IP address conflict? (Change the computer IP to 192.168.1.xx)

​​Q: How to solve video lagging? ​ ​
A: Ninety percent of the time it’s because of these two reasons:

1. The video bit rate is too high (transcoded to H.264 format, the bit rate is controlled within 8Mbps)
2. The computer memory is not enough (open the task manager to see if it exceeds 80%, you need to upgrade)

​​Q: What should I do if the screen suddenly goes black? ​ ​
A: Check in this order:

1. Touch the sending card temperature (hot means overheating, turn off the machine to cool down)
2. Look at the power indicator light (steady red = voltage instability)
3. Check the crystal head of the network cable (use a line tester to test the eight-core all-pass)

The editor has worked in technical support for more than ten years, and the most bizarre fault I have ever seen is that someone installed the control software on the C drive, and as a result, the system files were deleted when Windows automatically updated. So here’s a solemn reminder:​ ​The software must be installed on the D drive​ ​, and back up the parameter configuration file once a week.

There is also a trick for you: set a​ ​emergency recovery button​ ​, you can restore the latest stable state with one click. The specific operation is to save three sets of parameters in the "scenario mode": daily use, backup plan, and extreme test. In this way, even if you change the settings randomly with your hands, you can return to the normal state in seconds.

Finally, I would like to say something from my heart: Don’t be superstitious about automatic settings! Those functions known as "full intelligent adjustment" are not as reliable as manual parameter adjustment at critical moments. Especially when encountering major events, arriving two hours in advance to conduct the entire process test is more effective than any black technology.

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