Do those who are new to the industry often get stuck on this question? Obviously the display screen is installed and the signal source is connected, but the picture just won't come out. At this time, the master will knock on the machine and tell you: "The receiving card is not paired, right?" " When newbies hear this word, they probably immediately have three questions popping up in their minds: What is a receiving card? Why do you need it? Where should I buy it?

Let’s break this matter down first. For example, if you want to charge your mobile phone, you don’t just need a charging head, you also need a data cable, right? ​ ​The receiving card is the data cable that connects the video source and the LED screen.'​ ​. It is not only responsible for transmitting signals, but also translating video signals into a language that LED lamp beads can understand - does that sound too vivid?

​​The three most common pitfalls for novices​​：

1. Thinking that the receiving card is universal (actually it needs to match the main control chip)
2. Buying dismantled parts for cheap (second-hand failure rate is as high as 37%)
3. Ignore the transmission distance (more than 50 meters must use the optical fiber version)

There was a real case recently where mosaics appeared on a newly installed 4K large screen in a shopping mall. After struggling for three days, it was discovered that the reception card could not support the 3840Hz refresh rate. So this thing looks inconspicuous, but it can really kill you at critical moments. That's the problem——

Which channels can I buy reliable products from?

Let me start with some trivia: Industry statistics in 2023 show that 27% of LED screen failures are caused by receiving cards. You can’t buy this thing casually like buying a mobile phone case. You have to pay attention to these channels:

​​E-commerce platform​ ​(Suitable for emergency purchases)
Advantages: Order today and arrive tomorrow
Disadvantages: Models are confusing and difficult to match, technical support is basically guesswork

​​Professional manufacturer​ ​(Recommend long-term cooperation)
Advantages: Provide full-process technical guidance and support customized protocols
Disadvantages: Minimum order quantity required

​​second hand market​ ​(Exclusively for experienced drivers)
Advantages: The price is so cheap
Disadvantages: It may be harder to take care of after you buy it than your ancestors

Here comes the point! Recently, many customers have asked me: "Why does the same receiving card work on screen A but not on screen B?" " This matter has to start with the chip protocol. For example, Android charging cables cannot fast charge Apple phones. Nowadays, mainstream receiving cards support HDR10+ and HLG dual decoding, but some old models only recognize SDR signals.

Ask and answer core questions

Q: If the receiving card is broken, do I have to replace it as a whole?
A: It depends on the situation! If it is physical damage such as a loose interface, 80% can be repaired on site. ； But if the main control chip is burned, it is recommended to replace it with a new one. There is a trick for everyone: after receiving power from the card, the green light will normally light up. If the red light flashes, cut off the power immediately and check.

Q: How to judge which model to buy?
A: Remember three parameters: pixel load capacity (how many lamp beads each card can carry), refresh rate (≥1920Hz to play 4K), and transmission protocol (the most popular now is HDMI2.0+DP1.4 dual input)

Q: What should I pay attention to when purchasing overseas projects?
A: Voltage! Voltage! Voltage! Say important things three times. Southeast Asia mostly uses 110V voltage. The Japanese market requires PSE certification, and the European Union must bear the CE mark. There was a painful lesson last year: a certain engineering company installed a screen in South Korea and was fined 200,000 yuan because the EMC of the receiving card exceeded the standard.

Having said this, someone may want to ask: "What's so special about your receiving card?" " Let's put it this way, our engineering team has recently overcome the problem of grayscale maintenance under low brightness - at a brightness of 800cd/m², it can still present 16-bit delicate image quality. This is particularly important for shopping mall window displays. After all, no one wants to see a screen full of color blocks in broad daylight.

Editor's opinion: Buying a receiving card is like looking for a partner. Looks alone are not enough, you have to look at the internal compatibility. When purchasing next time, remember to ask the manufacturer for a technical parameter comparison table, and then take a video of the on-site installation environment to show the engineer. Don't be too troublesome, this can save 80% of the after-sales problems in the later period. By the way, some high-end models now support 5G signal backhaul, which is a life-saving feature for outdoor large screens that need remote control... (Suddenly remembered something) Oh, right! Recently, many customers are asking about the HDR real-time mapping function. We will talk about this next time.

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