Ouch hey! When I first received the LED screen, were you holding the instruction manual and scratching your head like I did? I was desperate because I had a wire inserted but the screen was black. The screen was still deformed and collapsed after three hours of debugging. I have stepped on all these pitfalls for you. Let's talk about something real today——​ ​How to play with LED screen connected to computer​​？

1. Understanding the interface type is the key

​​Don't rush to plug in the wires first! ​ ​ I have seen too many people stumble on the HDMI cable to VGA. These common interfaces for LED screens are:

To give a real case: I helped my friend install LED screens in the Internet cafe last year. It was normal for 20 computers and 19 computers, but one of them had no signal. Finally, I found out that the boss bought it cheaply​ ​HDMI to VGA converter​​, this thing can't bring 2K resolution at all!

2. Four steps to get the basic connection

​​Remember this formula: one look, two, three drive, four tunes​​：

1. ​​Look at the interface​​: First confirm that the computer and LED screen have HDMI or DP ports (many new graphics cards released in 2023 have cancelled VGA)
2. ​​Insert line​​: Recommended with gold-plated joints​​High-speed fiber optic cable​​, the transmission distance can reach 100 meters without attenuation (ordinary copper wires will be closed if they exceed 15 meters)
3. ​​Install driver​​:Don’t believe in “plug and play”! Go to the latest control software under the official website. Models that support 3840Hz refresh rate must be turned on manually.
4. ​​Adjust parameters​​: Focus on setting two values——​​Point-to-point zoom​​(Eliminate blurring of the picture) and​​Color temperature synchronization​​(Prevent the screen from blue and red)

​​Lessons of blood and tears​​: Once I installed an advertising screen in the mall and forgot to turn off the computer's automatic power saving mode. As a result, the large screen blacked out every half an hour, and the customer almost thought the store was closed!

3. Advanced operation in special scenarios

Don't panic when encountering these situations, and teach you how to deal with them:
▌ ​​How to do multi-screen splicing? ​ ​
A video processor is required to split the computer signal into multiple areas. Key inspection​ ​Synchronous card​​The firmware version, the three-screen screen made at the Buy Auto Show last year, caused the screen torn due to the failure to upgrade the firmware.

▌ ​​Is wireless screen projection reliable? ​ ​
Miracast is available for temporary demos, but with a delay of at least 200ms. To be stable, it has to be used​ ​Professional wireless transmitter​​, the delay can be pressed to within 30ms in the 5GHz band

▌ ​​Poor compatibility with Mac computers? ​ ​
Open in System Preferences​ ​HIDPI mode​​, the resolution will be doubled directly. I have tested the MacBook Pro with the M1 chip, and it can run to a 192Hz refresh rate with a 4K screen connected to it.

4. First aid guide for abnormal pictures

​​Black screen/flower screen/flash screen​​Three major terminal illnesses are treated like this:

1. ​​Check power supply​​: When the LED screen power is ≥500W, the circuit must be separately carried out (the maximum load capacity of ordinary sockets is 2500W)
2. ​​Measure the signal​​: Use a signal detector to view the waveform chart. If the attenuation exceeds -3dB, you must add a repeater.
3. ​​Change port​​: Sometimes the graphics card's DP port will pick the line, and changing the HDMI port may be a surprise.

Last month I encountered a strange case: the customer's newly renovated office, and the LED screen flashed in the afternoon. Finally found out​ ​Central air conditioner electromagnetic interference​​, put a magnetic ring on the video cable and solve it immediately!

5. Don't save these accessories

​​Shopping list of people who have experienced it​​Please keep:

• ​​Lightning protection plug-in​​: The probability of outdoor screen being struck by lightning is higher than winning the lottery (especially in the rainy season in the south)
• ​​Wire slot management​​: The spider web-like wire is not only ugly, but also prone to short circuits.
• ​​Spare cable​​: It is recommended to prepare more video cables of the same model, which can save lives at critical moments

A restaurant owner saved a small amount of money and suffered a big loss - using the HDMI cable with free shipping of 9.9, but the graphics card was burned, and the maintenance fee was enough to buy 30 good cables!

Soul torture time

​​Q: What should I do if my laptop cannot carry a 4K screen? ​ ​
A: Two solutions: ① Reduce the rendering resolution in the graphics card control panel ② Connect the video processor with independent decoder

​​Q: How to break the gray when playing HDR videos? ​ ​
A: Three steps: 1. Set HDR mode on Windows 2. Enable HLG mode in the screen menu 3. Render the player with madVR

​​Q: Can't you understand the control software in English? ​ ​
A: I secretly tell you a secret - change the system language to traditional Chinese, and many software will switch synchronously (simplified Chinese translation often lags)

You should have discovered this.​​Connecting the LED screen is a meticulous job​​. Don’t be fooled by sales or “one-click”. From line selection to debugging, everything is knowledge. Next time you encounter a problem, please read this article first and check it out to ensure that you avoid detours for three years! Remember, good screen = good hardware + good settings + good maintenance. Nothing is missing from these three tricks!

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