LED display control card FAQ

LED displays are primarily used to show text, images, videos, and other types of information. To ensure the display functions properly, it is essential to use compatible LED control cards along with the necessary accessories. The LED control card must be configured correctly, taking into account environmental factors such as weather, location, and user settings in order for the display to operate effectively. Once the control card is connected to a sufficient power supply and properly linked to the LED display modules, the software scan mode and OE (Output Enable) direction should be set accurately. Additionally, all cables must be securely connected. What are the common issues that occur with LED control cards, and how can they be resolved? **First, Hardware Connection Issues** 1. **How to determine if the control card is working properly?** After powering on the control card, check the power indicator. A red light indicates that 5V power is being supplied. If the light doesn't turn on, immediately turn off the power and inspect the 5V connection for issues like overvoltage, reverse polarity, or short circuits. It's recommended to use an independent 5V power source for the control card. If the red light still doesn’t come on, the card may need repair. 2. **Why is there no display or abnormal brightness even when the control card is working?** If the control card and driver are properly connected, the default scan mode is usually set to 16. If nothing is displayed, verify the data polarity and OE polarity settings in the control software. If the brightness is uneven, especially if one line is too bright, this may indicate an incorrect OE setting. Adjust the OE polarity accordingly. 3. **Why does the system show an error when sending data to the control card?** Check the communication interface connections and ensure the jumper settings on the control card match the required configuration. Also, confirm that the voltage is above 4.5V using a multimeter. Verify that the control card settings are correctly configured in the software. 4. **Why isn’t the display showing the loaded content properly?** Ensure that the correct scan output is selected in the "Control Card Settings" menu. Incorrect settings can lead to improper display behavior. 5. **Why is 485 network communication not smooth?** Check the wiring configuration. Connecting multiple screens directly to the computer’s interface can cause signal reflection and interference. Use the correct connection method as 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 step-by-step diagnostic. First, test the MODEM by connecting it to another computer and using a serial port debugging tool. Set the receiving MODEM to auto-answer and test the connection. If the MODEM works correctly, check the control card settings, including baud rate, serial port, and protocol. Then, use the offline king software to send the script with the correct communication parameters. **Second, Software Application Issues** 1. **Why does the text alignment not match the display window?** If the alignment doesn’t match the position of the text in the display window, check the text box for any extra spaces or line breaks and remove them. 2. **Why does a display item disappear during playback?** If the item flickers or disappears, check the dwell time setting. If it is set to 0 or 1, increase the value to ensure the item remains visible. 3. **Why does the scrolling text look choppy or irregular?** If the text scrolls left but appears broken or delayed, adjust the scroll speed in the settings to make it smoother. 4. **How to clear multiple windows at once?** Use the "Clear Screen" button to remove all content from the display simultaneously. 5. **How to keep a display item fixed on the screen permanently?** Avoid setting the screen to clear when adjusting the display style. Also, ensure the item is not covered by other elements when configuring its position. 6. **How to select an animation file for display?** When creating a display file, you can choose an animated GIF to add dynamic effects to your content.

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