Friends who are new to LED displays, please pay attention! Recently, many customers asked me: "Which port should I plug in this HDMI1 interface? Why didn't I react when I plugged in? "Alas, this question seems simple, but many people have fallen into it in actual operation. Today we will talk about it and teach you step by step to find this "signal life gate".

1. Three major hardware items

​​Let's talk about the most basic equipment​​——Your computer and LED screen must first match the numbers. According to industry statistics, 32% of connection failures are caused by interface mismatch. Here is the key point:​ ​Identify the trapezoidal shape of the HDMI interface​​, don't get confused with the USB port. Last year, a customer forced the HDMI cable into Type-C, but the motherboard burned and lost more than 5,000 yuan!

​​List of essential equipment​​：

1. ​​HDMI2.0 or above specifications cable​​(Don’t buy 9.9 for free shipping, transmission of 4K signals will cause snowflakes)
2. ​​Computer output port confirmation​​(Lamps are usually on the side, and desktops are in the graphics card position)
3. ​​LED screen input port positioning​​(Check the interface marked HDMI1, usually with a numeric number)

To give a real case: When a shopping mall was installing a 4K advertising screen, the purchasing department bought three batches of wire materials of different specifications. Finally, the test found that only wires with the "High Speed" logo can transmit HDR signals stably.

2. Five-step fool-style connection method

Don't panic when you encounter a device! Remember this mantra: "Come on the right seat, close it first and then open it." When I was helping customers with debugging last month, I found that someone hot-swap and burned the interface chip.

1. ​​Power off operation​​：
   Turn off the computer and LED screen power supply first (it is easy to ignite when operating with live)
2. ​​Interface matching​​：
   Find trapezoidal port with "▷|◁" symbol on the computer (don't get confused with the DP port)
   The LED screen end is aware of HDMI1 (multi-interface devices need to choose the main channel)
3. ​​Wire insertion​​：
   Hearing the "click" sound is considered to be inserted (don't turn on the computer after halfway through it)
4. ​​Power-on sequence​​：
   Turn on the LED screen first, then start the computer (avoid signal handshake failure)
5. ​​Signal switching​​：
   Press the "Source" key of the remote control to switch to the HDMI1 signal source

Special reminder: Don’t rush to smash the device when you encounter a black screen! Try Win+P toggle the display mode, it is probably set to "second screen only".

3. Three major overturned first aid guide

Now I’ll teach you how to deal with it – last year’s industry report showed that 68% of beginners were in these places:

​​Scene 1: There is no response when plugging in​​

• Check whether the wire supports 4K@60Hz (old wire only reaches 1080p)
• Update the graphics card driver (N card users focus on this)
• Try other HDMI ports (maybe interface oxidation)

​​Scene 2: The screen flashes​​

• Shorten the length of the wire (with a signal amplifier required for more than 15 meters)
• Turn off the computer's energy-saving mode (there will be exhausted if the graphics card is insufficient)
• Adjust the refresh rate (match the 1920Hz parameter of the LED screen)

​​Scene 3: The sound is missing​​

• Right-click the volume icon to select "play device""
• Set the LED screen as the default audio output
• Check whether the HDMI cable supports audio transmission (some castrated versions of cables only transmit images)

Last week I encountered a funny and hilarious case: a customer inserted the audio cable into the headphone jack of the computer and then asked why HDMI didn't sound...

4. Hidden skills of professional players

The old bird who has worked in the project for ten years will teach you a few unique skills:

1. ​​Dust-proof interface​​：
   Dust-proof plugs that are not used for a long time (the maintenance fee for an oxidation interface of a certain brand of screen is 800 per unit)
2. ​​Wire fixing method​​：
   Use cable clamps to fix the HDMI connector (prevent poor contact caused by pulling)
3. ​​Signal enhancement secrets​​：
   When the transmission distance exceeds 10 meters, install an HDMI repeater with power.

Tested data: After adding a repeater, the 4K signal transmission distance is increased from 15 meters to 45 meters, the screen delay is reduced to within 3ms, and the e-sports competition level level!

Editor's opinion time

I have seen too many people use HDMI ports as USB, which is really a pain! Say something heart-to-heart:​ ​Selecting an interface is more important than selecting a screen​​. The 4K floor tiled screen at a certain exhibition last year was flashed wildly during the on-site demonstration because it used a low-quality adapter, which scared the customer away.

It is recommended that novices keep in mind two "ten millions":

1. ​​Do signal pressure tests​​(It is considered qualified to play 4K videos for 8 hours without lag)
2. ​​Keep the original adapter​​(Third-party accessories compatibility is like opening a blind box)

Remember: A good screen must be equipped with a good connection! Don’t let one wire ruin the entire set of equipment. After all, the HDMI interface of professional-grade LED screens now adopts gold plating technology. It can be designed for ten years, so don’t be stuck on the nine-nine-nine-sized line!

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