The LED display screen is a display method by controlling semiconductor light-emitting diodes. It is composed of tens of thousands-hundreds of thousands of semiconductor light-emitting diode pixels uniformly arranged. It uses different materials to make LED pixels of different colors to display text, graphics, images, animations, market quotations, videos, video signals and other information display screens. It is widely used in securities trading, financial information display, and airports. Flight dynamic information display, tourist guide information display at port stations, sports venues, road traffic display, dispatch command center information display, postal, telecommunications, shopping malls, advertising media new product display and other places.
In practical applications, LED display screens will inevitably encounter various failures, which will cause inconvenience to the application of industry users and affect the efficiency of use. This article will summarize some common problems and solutions in the daily application of LED displays.
Regarding the various situations and solutions that the screen does not light up
As the LED electronic display screen is used for a long time, some malfunctions may occur. If the LED electronic display screen has the following brightness problems, you can check it against it:
Ⅰ. The whole screen is not bright (black screen)
1. Check whether the power supply is energized.
2. Check whether the communication line is connected and whether it is connected incorrectly. (Sync screen)
3. The synchronization screen detects whether the green light of the communication between the sending card and the receiving card flickers.
4. Whether the computer monitor is protected, or the display area of the screen is black or pure blue. (Sync screen)
Ⅱ. The whole unit board does not light up (black screen)
1. If several consecutive boards do not light up in the horizontal direction, check whether the cable connection between the normal unit board and the abnormal unit board is connected; or whether the chip 245 is normal.
2. If several consecutive boards are not lit in the longitudinal direction, check whether the power supply of this column is normal.
Ⅲ. The unit board does not light up
1. Check if the line pin is connected to the 4953 output pin.
2. Check if 138 is normal.
3. Check whether 4953 is hot or burned.
4. Check whether 4953 has a high level.
5. Check if the control pins 138 and 4953 are connected.
Ⅳ. The unit board does not light up
1. Check if 595 is normal.
2. Check whether the corresponding through pins of the upper and lower modules are connected.
3. Check if there is a connection between the 595 output pin and the module pin.
Ⅴ. The unit board lacks color
1. Check whether the 245 R.G data is output.
2. Check whether the normal 595 output pin and the abnormal 595 input pin are connected
In addition to the screen does not light up, the following are the possible problems and solutions for the LED electronic display
01. What could be the cause of the failure to load?
The loading failure may be caused by the following reasons, please compare with your operation according to the listed items:
A. Ensure that the control system hardware has been powered on correctly. (+5V)
B. Check and confirm that the serial cable used to connect to the controller is a straight-through cable, not a crossover cable.
C. Check and make sure that the serial port cable is intact and the two ends are not loose or falling off.
D. Compare the LED display control software and the control card you choose to select the correct product model, correct transmission method, correct serial port number, correct baud rate, and correctly set the control system hardware according to the dial switch diagram provided in the software The address bit and baud rate on the.
E. Check whether the jumper cap is loose or falling off; if the jumper cap is not loose, please make sure that the direction of the jumper cap is correct. F. If it still fails to load after the above inspection and calibration, please use a multimeter to measure whether the serial port of the connected computer or control system hardware is damaged. To confirm whether it should be returned to the computer manufacturer or the control system hardware for testing.
02. What could be the cause of the communication failure?
The reasons for the communication failure and the loading failure are roughly the same. It may be caused by the following reasons. Please compare with your operation according to the listed items:
A. Ensure that the control system hardware has been powered on correctly. (+5V)
B. Check and confirm that the serial cable used to connect to the controller is a straight-through cable, not a crossover cable.
C. Check and make sure that the serial port cable is intact and the two ends are not loose or falling off.
D. Compare the LED display control software and the control card you choose to select the correct product model, correct transmission method, correct serial port number, correct baud rate, and correctly set the control system hardware according to the dial switch diagram provided in the software The address bit and baud rate on the.
E. Check whether the jumper cap is loose or falling off; if the jumper cap is not loose, please make sure that the direction of the jumper cap is correct. F. If it still fails to load after the above inspection and calibration, please use a multimeter to measure whether the serial port of the connected computer or control system hardware is damaged. To confirm whether it should be returned to the computer manufacturer or the control system hardware for testing.
03. Why does the system prompt "Please connect to the LED display controller"?
Many customers and friends directly download the "LED display control system" from the "Download Center" on the company's website, and the prompt "Please connect to the LED display controller" will appear after running for 20 minutes after installation. This is due to the system The reason for wide control system hardware was not detected within the test time.
At this time, please connect one end of the LED display control system hardware you purchased to the computer, and the other end to the HUB distribution board. Connect the cable socket of the HUB distribution board to the interface of each unit of the LED display.
After the connection is completed, you can enter the "Settings Screen Parameters" in the "Settings" to set the relevant parameters, and then close and reopen the software after completion. At this time, the word "Connected successfully" will appear on the top of the software. At this point, the system has detected the display screen control system hardware, and can be used normally without time limit.
04. Why does the LED display control system hardware have a bright line or "fuzzy screen" for a few seconds when it is first powered on?
After the display controller is properly connected to the computer and the HUB distribution board and the display, you need to provide +5V power to the controller to make it work normally (at this time, do not directly connect to 220V voltage). At the moment of power-on, a bright line or "fuzzy screen" will appear on the display for a few seconds. This bright line or "fuzzy screen" is a normal test phenomenon and reminds the user that the display is about to start working normally.
Within 2 seconds, the phenomenon will be automatically eliminated, and the display will enter normal working status.
05. What does automatic or manual brightness adjustment mean?
Brightness adjustment refers to the adjustment made between the darkest and brightest that can be displayed on the screen. Rather than photosensitive adjustment.
Automatic brightness adjustment is automatically adjusted to a predetermined brightness by the wide LED display control system according to the different brightness that should appear in different time periods.
Manual brightness adjustment means that the end user makes the LED display screen reach a certain specified brightness through the operation of the wide LED display control system.
06. Why is there no display on the display when the controller is normal? When the controller setting and the connection line are properly connected, sometimes there will be no display on the LED display screen. Generally, it is caused by one of the following reasons. Please check against it:
A. Whether the LED display is normally powered on.
B. Is the connection between the HUB distribution board and the display screen reversed?
C. Whether the edited and sent program is empty.
07. The whole screen of the unit board is not bright, dark and bright.
A. Visually check whether the power connection cable, the 26P cable between the unit boards and the power module indicator light are normal.
B. Use a multimeter to measure whether the unit board has normal voltage, and then measure whether the voltage output of the power module is normal, if not, it is judged that the power module is bad.
C. Measure the low voltage of the power module and adjust the fine adjustment (the fine adjustment of the power module near the indicator light) to make the voltage reach the standard.
08. What is the cause of the black screen on the LED display?
In the process of using the control system, we occasionally encounter the phenomenon of a black screen on the LED display. The same phenomenon may be caused by a variety of different reasons, even the process of blackening the display screen will vary due to different operations or different environments. For example, it may be black the moment it is powered on, it may turn black during the loading process, or it may turn black after sending. When encountering this phenomenon, please note that you can refer to the following aspects to judge the "fault":
A. Please make sure that all hardware including the control system has been powered on correctly. (+5V, do not connect reversely or wrongly)
B. Check and confirm again and again whether the serial port cable used to connect to the controller is loose or disconnected. (If it turns black during the loading process, it is probably caused by this reason, that is, the communication line is interrupted due to the loosening of the communication line during the communication process, so the screen is black. Do not think that the line cannot be loose if the display body does not move. Check it out by hand, this is important if you want to solve the problem quickly.)
C. Check and confirm whether the LED display screen and the HUB distribution board connected to the main control card are tightly connected and plugged in.
