Are newbies who are new to LED screen operations often worrying about the flashing clock? Although I looked at the time setting items in the control software, I couldn't find the adjustment portal on the display screen. Today we will use the most straightforward truth to break this layer of window paper-​​The time setting of the LED display is not the same routine as you think​​。

1. First understand the "brain structure" of the display screen

​​Synchronous and asynchronous systems​Just like the left and right hands of a person, it determines the fundamental logic of time setting. When we installed fence screens for Tokyo Stadium, we encountered the embarrassment of the sudden disconnection of the synchronization system:

• ​​Synchronous control system​: Like a puppet, you must be connected to a computer to move. Changing the time is like adjusting the phone clock. Just click on the computer a few times.
• ​Asynchronous control system​: It comes with a memory chip, and you can run even if you are disconnected from the Internet. The time entrance of this type of screen is hidden deep, and it must be changed using a USB flash drive or a dedicated APP

​​Give a practical example​​: The promotional information screen in the mall displays special offer information during the day and close the store notification at night. This is a typical asynchronous system, and the setting time must be imported into the program through the control card.

2. Complete analysis of the three major settings

​​Entry 1: Computer-side control software​​
It is suitable for fixed large screens installed in the control room, such as the transparent window screen we made for Korea. Pay attention to when operating:

• Calibrate the computer time first, if one minute is missing, it will cause the display to be incorrect.
• Find the "Calibration Display Time" button (different software names are different)
• ​​ Must click the Send key​! I have seen too many people who did not send them after making corrections, staring at the screen

​​Entry 2: USB drive import mode​
This method is commonly used in outdoor advertising screens, and the key points are to pay attention to:

• The USB drive is formatted to FAT32, otherwise it will not be able to read it
• Check the "Sync Time" option in the import interface
• Before pulling out the USB flash drive, the control card may be burned

​​Entry 3: Remote control of mobile APP​​
New models of display screens have begun to popularize this function, but there are two pitfalls:

• Android phones are more compatible than Apple, especially older iPhones are easily disconnected
• It is necessary to keep Bluetooth turned on throughout the whole process, and it must be repeated when disconnecting in the middle.

3. Five major culprits of inaccurate time

​1. Control card clock chip deviation​
A common problem with asynchronous systems is that the monthly error of a good chip is less than 3 seconds, and the difference is half a minute. There is a trick: Set up​Daily automatic calibration time​​, automatic alignment like an radio wave meter

​2. The supply voltage is unstable​
Voltage fluctuations exceeding ±5% will cause the clock chip to get exhausted. Installing a voltage regulator can solve 90% of the problems, especially in areas with frequent thunderstorms.

​3. Dramatic changes in temperature​
The outdoor screen time slows down in winter and the summer is faster. This is not metaphysics! The working temperature of the control card is best kept at -20℃~60℃

​4. Software conflict​
The most outrageous case I have ever seen: the antivirus software kills the control program as a virus, and the time setting is directly invalid

​​5. Magnetic interference​
Display screens close to elevators and transformers are most likely to be hit, and adding a magnetic shield can relieve it.

4. Ask and answer core questions

​​Q: Why did I change the time display and fail to respond?​​
A: Ninety percent of these three links have problems:

• No send key is clicked (accounting for 60% of the repair cases)
• The control software version is too old (the software before 2018 did not support automatic calibration)
• The display is locked (press the menu key for 5 seconds to unlock)

​​Q: What should I do if I always jump randomly on rainy days under the outdoor screen?​​
A: Follow this process to check:

1. Check whether the waterproof tank seal is aging
2. Measure whether the supply voltage of the control card is stable
3. Apply a constant temperature protective cover to the clock chip
4. Last updated the firmware version of the control card

To understand these tricks, setting up the LED time is as simple as adjusting the alarm clock. Recently, a new trend has been discovered: third-generation control cards with GPS automatic timing have become popular, and the error can be controlled at 0.01 seconds. Next time, if the time is inaccurate, don’t rush to scold the manufacturer. Let’s see if it’s time to upgrade the hardware. Remember, a good horse is paired with a good saddle, and even the most advanced display screen must be equipped with a reliable operation method.

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