LED display control card FAQ

LED displays are primarily used to show text, images, videos, and other types of information. To ensure proper operation, they require supporting components such as LED control cards. These control cards must account for various factors like weather, geography, and user behavior to function correctly. When the LED control card is connected to a stable power supply, properly linked to the LED display module, and the software scan mode and OE direction are set appropriately, the system should operate smoothly. However, issues can still arise. Here are some common problems with LED control cards and how to address them. **First, hardware connections** 1. **How to determine if the control card is working?** After powering on the control card, check the power indicator. A red light indicates that 5V is being supplied. If it doesn’t light up, immediately turn off the power and check for issues such as incorrect voltage, reverse polarity, or short circuits. It’s recommended to use a separate 5V power supply for the control card. If the light still doesn’t come on, the card may need repair. 2. **Why is there no display or abnormal brightness after the control card is connected?** The default scan mode is usually set to 16. If there's no display, check the data and OE polarity settings in the control software. If one line is too bright, it might be due to an inverted OE setting. Adjust it accordingly. 3. **What to do if the system shows “An error has occurred and transmission failed”?** Verify that the communication interface is correctly connected and that the jumpers on the control card are set properly. Ensure that the control card settings are correct and that the operating voltage is above 4.5V. Use a multimeter to double-check the voltage. 4. **Why isn't the display showing the loaded content?** Check if the scan output is correctly selected in the "Control Card Settings" menu. 5. **Why is the 485 network communication not smooth?** Make sure the communication lines are connected properly. Avoid connecting multiple screens directly to the computer interface, as this can cause signal interference. Follow the correct connection method outlined in the "Communication Interface Usage and Precautions" guide. 6. **How to fix unclear communication when using GSM or remote dialing?** If communication is unstable, perform a segment test. First, check the MODEM by disconnecting it from the control card and connecting it to another computer. Use a serial debugging tool to configure the MODEM. Set the receiving end to auto-answer using the command "ATS0=1", then attempt to dial the other end. If the connection works, the problem is likely in the control card settings. After confirming the MODEM is working, check the control card settings. Ensure the baud rate, serial port, and protocol are correctly configured. Then use the offline king software to adjust the communication settings and send the script again. **Second, software application** 1. **Why does the design alignment not match the display window?** If the text alignment doesn’t match the display window, check the edit box for extra spaces or line breaks and remove them. 2. **Why does a display item disappear during playback?** If an item flashes or disappears, check its dwell time setting. If it's set to 0 or 1, increase the value to ensure it remains visible. 3. **Why does the scrolling text look choppy?** If the text scrolls unevenly with pauses, increase the scroll speed in the settings. 4. **How to clear multiple windows at once?** Use the "Clear Screen" button to reset all windows simultaneously. 5. **How to make a display item stay fixed on the screen?** Avoid setting the screen to clear when adjusting the display style. Also, ensure the item isn’t covered by other elements when positioning the display window. 6. **How to choose an animation file?** When creating a picture file, you can select an animated GIF to add motion effects.

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