Friends who are new to LED displays are often confused by various professional terms? Especially the mysterious "send card", I know it is very important, but I can't even figure out what it looks like and where it is hidden. Today, let’s talk about this question that drives novices crazy - where is the sending card located in the display?

​​The true face of the sending card​​

Actually, the location of this sending card is not mysterious. Imagine it's like​ ​The brain of the display​​, specializes in "translation" the pictures in the computer into language that can be understood by LED light beads. Usually it will be hidden in three places:

1. ​​Inside the control box​​: In the iron box on the outdoor advertising screen, you can always see this matchbox-sized metal block
2. ​​Behind the splicing screen​​: LED TV wall used in the conference room, the sending card is attached to the back of the splicing unit
3. ​​Mobile bracket mezzanine​​: In the quick disassembly and assembly box of the stage rental screen, it has a shockproof card slot specially left for it

​​Three common sense that novices must know​​

Don't rush to find a screwdriver to remove the equipment! Let’s understand these key points first:

• ​​Not all screens need​​: Like a small-size signage screen in a convenience store, you can use it by plugging in the USB flash drive.
• ​​Distance determines location​​: The display screen within 20 meters, the sending card may be in the computer host box； Large screens over 50 meters must be installed near the display screen
• ​​Recognize your ID number​​: Each sending card has 12 digits​​SN code​​This is more important than position

​​Practical skills for positioning sending cards​​

When equipment failure occurs, the masters do this:

1. Follow the signal line: Start from the HDMI port of the computer, touch the interface box at the display end along the network cable/fiber
2. Listen to sound and position identification: There will be a slight current sound when the sending card is working, and you can hear "sizzle" sound when you stick to the device shell
3. Look at the indicator light status: When working normally, the green signal light will flash regularly like a breathing light

There is a real case recently: a large 3D screen in a shopping mall suddenly blacked out, and the maintenance personnel passed​​Control box temperature detection​​, I found that the sending card hidden in the air outlet of the air conditioner was damaged by condensation water. Therefore, environmental factors will also affect its hiding position.

​​Common misunderstanding comparison table​​

It is most likely for beginners to get confused about these concepts:

​​Self-help guide when encountering problems​​

When snowflakes appear on the display screen or stutter, don’t panic! Check in this order:

1. Touch the shell temperature: The heat dissipation problem may be due to hotter than 50℃
2. Check the connection line: Is there any oxidation and blackness of the crystal head of the network cable?
3. Look at the indicator light: The red light is always on = the power supply is faulty, the green light is not on = the signal is interrupted
4. Note the error code: For example, E02 means the resolution mismatch

If you can't handle it yourself, remember to use the manufacturer's​​24-hour technical support​​. Now many companies provide remote diagnosis services, and take a video of the fault and send it to them. Engineers can guide the reset operation online.

Now you should understand that the location of the sending card is not fixed. With the development of technology, some high-end screens have now been implemented​ ​Integrated sending and receiving design​​, this small metal box may become smaller and smaller, and may even be directly integrated into the display module. However, no matter how change is, remember its core mission - accurately conveying wonderful pictures to each lamp bead, this basic logic will never change.

Next time I see the cool big screen in the mall, I might as well imagine: At this moment, there is a dedicated sending card, silently completing tens of thousands of data conversions per second in a corner. The charm of technology is often hidden in these invisible details.

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