Hey guys, have you ever encountered this kind of situation? The LED screen I bought for a lot of money looks normal during the day, but at night it flashes like a disco! Don't rush to smash the screen, it's probably because the control card is acting like a monster! Today we will break it apart and break it into pieces to talk about how to serve this "brain" hidden behind the LED screen.

1. What exactly does the control card do?

Let's put it this way, the control card is the "nerve center" of the LED screen. Last year, a shopping mall in Guangzhou suffered a big loss - it used a counterfeit control card, and as a result, the big screen was in disgrace on the opening day. This thing mainly takes care of three things:

• ​​transfer data​ ​:Cut the screen on the computer into a digital signal that LED can understand
• ​​tube brightness​ ​: Automatically adjust according to ambient light, no blinding at noon or dazzling in the middle of the night
• ​​with rhythm​ ​: Control the refresh rate. Cards lower than 1920Hz will definitely make you dizzy after watching them for a long time.

2. What are the pitfalls of choosing the wrong control card?

I know an old man who bought a second-hand card for cheap, and found out:

1. Synchronous control cards are sold as asynchronous (this is like installing a tricycle engine in a sports car)
2. The loading point is falsely marked at 30% (it is said that it can carry 50 square meters, but the actual 35 square meters will be stuck as a PPT)
3. The heat-dissipating aluminum plate is as thin as a piece of paper (temperatures soar to 80°C in summer, so hot that you can fry an egg)

The most shocking thing is that the card used by a wedding company does not support power-off memory, and the parameters have to be re-adjusted every time it is restarted, which almost drives the host crazy!

3. What does a serious control card look like?

Let’s take the industry benchmark product as an example (definitely not an advertisement). A good card must meet:

• ​​The interface must be complete​ ​: HDMI, DVI, and network ports are essential. It is best to have an optical fiber port to prevent interference.
• ​​Chips need to be hard-core​ ​: Xilinx or Altera’s main control chip is the bottom line
• ​​Heat dissipation must be reliable​ ​: Aluminum heat sink thickness ≥2mm, with intelligent temperature control fan
• ​​Software needs to be smart​ ​: Mobile APP can be debugged remotely and supports multi-screen linkage.

There is a real case: the control card of a high-tech enterprise in Shenzhen is as stable as an old dog in the Harbin Ice and Snow World at minus 25 degrees, and has not failed in three years.

4. The installation location should be particular.

Never just stuff the control card behind the screen! Remember these three life-saving principles:

1. ​​Keep away from heat sources​ ​: At least 30cm away from the power module
2. ​​Moisture and dustproof​ ​: A separate chassis with protection grade ≥ IP54 is required.
3. ​​Convenient for maintenance​ ​: Don’t install it at an altitude of more than 2 meters. The maintenance technician is not Spider-Man.

Last year, a certain cinema in Hangzhou made a stupid mistake - it installed the control card in the ceiling, but it ended up costing 8,000 yuan in scaffolding to replace the card!

5. How to choose after-sales protection?

As the old saying goes, "What you buy is not what you sell", but good manufacturers dare to promise this:

• ​​Three-year replacement guarantee​ ​: It’s not repair, it’s just replacement.
• ​​48 hours door-to-door service​ ​: Even if you add money in remote areas, you have to arrive within three days.
• ​​Free upgrade​ ​: Software system lifetime updates

Here comes the point! Be sure to ask whether the load capacity is the "real standard". Some unscrupulous merchants will deceive people by treating the peak load as a normal parameter.

personal opinion time

Let me tell you, choosing a control card now is like choosing a mobile phone - you can't just look at the beautiful parameters, you have to look at the actual experience. Some manufacturers have begun to play with the "combination of software and hardware", such as developing control cards with AI algorithms that can automatically identify the content of the screen and adjust the brightness. This approach is quite right. Recently I have seen some companies doing​ ​5G cloud control system​ ​, you can change the program list by scanning the QR code with your mobile phone. This is truly advancing with the times.

Finally, let me tell you the truth: Don’t believe the nonsense about “one card being passed down to three generations”! Nowadays, LED screens are being updated so quickly that the control card has a lifespan of five years. Remember, sooner or later, the money saved on the card will have to be doubled to the repairman. We have to figure this out!

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