Causes and Solutions for Garbled Code on LED Displays

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  • Causes and Solutions for Garbled Code on LED Displays

    • Causes and Solutions for Garbled Code on LED Displays

    23 views admin 2025-09-25

    • Garbled code on an LED display is usually caused by signal transmission issues, hardware connection problems, software settings, or equipment failure. Follow the troubleshooting logic of start with the simple then move to the complex, check external factors before internal ones. Below are detailed steps.
     
    • I. First, Check Basic Physical Connections (Most Common Cause)
     
    • Loose or poor physical connections are a frequent cause of garbled code. Rule these out first.
     
    • 1. Check Power Cables
     
    • Confirm that the main display power and the controller card power cables are plugged in securely, with no oxidation or looseness at the interfaces. Unstable power supply can cause abnormal data processing, leading to garbled code. If multiple power supplies are used, check if any has failed (e.g., indicator light is off). Test by replacing with a known-good power supply.
     
    • 2. Check Signal Cables (Core Transmission Link)
     
    • Common signal cables HDMI, DVI, VGA, network cable (for synchronous displays), USB cable (for asynchronous displays).
     
    • Action Unplug and firmly reseat the signal cables. Clean any dust or oxidation from the ports.
     
    • If you have spare cables, directly replace and test to rule out internal breaks or poor shielding in the cable.
     
    • 3. Check Module Ribbon Cables (Focus for Indoor Displays)
    • Indoor LED modules are connected via ribbon cables. If a ribbon cable is loose, inserted backwards, or has oxidized contacts, it can cause localized garbled code.
     
    • Action Check the ribbon cables between modules one by one. Ensure they are oriented correctly (red edge to red mark) and inserted fully. Clean the contacts with an eraser and reinsert.
     
    • II. Troubleshoot Signal Source and Transmission Path Issues
     
    • Abnormalities in the signal source or intermediate transmission equipment can cause data parsing errors and garbled code.
     
    • 1. Test the Signal Source Itself
     
    • If the display is connected to a computerset-top boxplayer, first connect the signal source to a regular monitor to confirm the output content is normal (this rules out garbled code originating from the source itself, like a system fault or player decoding error).
     
    • Adjust signal source parameters Set the resolution and refresh rate to the display's recommended parameters (check the display manual or control software, e.g., 1920x1080@60Hz). Parameter mismatch can cause data transmission misalignment.
     
    • 2. Check Intermediate Transmission Equipment
     
    • If devices like splitters, matrices, or repeaters are used (common in multi-screen or long-distance transmission scenarios), temporarily bypass these devices. Connect the signal source directly to the display using the signal cable. Observe if the garbled code disappears (this rules out device failure).
     
    • Long-distance transmission (e.g., network cable over 100 meters) Signal attenuation can cause garbled code. Ensure qualified Cat6Cat6a cables are used, or add a gigabit repeaterfiber optic transceiver.
     
    • III. Check Control Software and Controller Card Settings
     
    • The core control of the LED display relies on the controller card + control software. Incorrect parameter configuration is a typical cause of garbled code.
     
    • 1. Restart Control Software and Controller Card
     
    • Close the LED control software (e.g., NovaStar, Linsn, Huei, etc.). Unplug the controller card's power for 10 seconds, then restart it. Reopen the software. Most temporary program glitches can be resolved by restarting.
    • 2. Verify Screen Parameter Configuration
     
    • Access the Screen Settings or Display Parameters in the control software. Key parameters to check (errors here directly cause data parsing garbled code)
     
    • Screen WidthHeight Must match the actual number of connected LED modules (e.g., 16 modules of 32x32 pixels wide = Width of 1632=512 pixels).
     
    • Controller Card Model Ensure the model selected in the software matches the physically installed card (e.g., NovaStar M32, Linsn RV901).
     
    • GrayscaleScanning Method Set according to the display specifications (e.g., 16-bit grayscale, 116 scan). An incorrect scanning method will cause display chaos.
     
    • If parameters are forgotten, use the software's Read Parameters function (requires connection to the card) or reset to factory defaults and reconfigure.
     
    • 3. Update Controller Card Firmware and Software
     
    • Outdated controller card firmware or control software may have compatibility bugs causing garbled code.
     
    • Action Download the latest firmware and software from the controller card manufacturer's website. Follow instructions to upgrade (back up current parameters before upgrading to avoid loss).
     
    • IV. Troubleshoot Hardware Failure (When steps above are ineffective)
     
    • If the above steps don't resolve the issue, hardware failure is likely. Targeted inspection is needed.
    • 1. Determine if it's a Single Module Failure
     
    • If only one or a few modules show garbled code while other areas are normal, it's likely a damaged driver IC or board line fault in the corresponding module(s).
     
    • Test Swap a known-good module into the garbled code area. If the garbling disappears, the original module is faulty and needs repair or replacement.
     
    • 2. Determine if it's a Controller Card Failure
     
    • If the entire screen is garbled, shows No Signal, or remains abnormal after changing cablessources, the sending card (connected to source) or receiving card (connected to modules) might be faulty.
     
    • Test Replace with a spare controller card of the same model. If the garbled code is resolved, the original card is damaged and needs repairreplacement by the supplier.
     
    • 3. Check Power Supply Stability
     
    • Abnormal power supply output voltage (e.g., a 12V supply outputting below 11V) can cause abnormal operation of the controller card and modules, leading to garbled code.
     
    • Test Use a multimeter to measure the power supply output voltage. Ensure it meets the display requirements (common 12V or 5V, error should not exceed ±0.5V). If voltage is unstable, replace with a qualified power supply.
     
    • V. Special Scenario Supplements (Outdoor Displays Rental Displays)
     
    • Outdoor Displays Check if waterproof connectors have water ingress (rainwater can cause signal short circuits and garbled code). If water is found, power off, dry thoroughly, and then test.
     
    • Rental Displays Frequent assemblydisassembly can cause wear on ribbon cables and connectors. Focus on checking the contact points of quick locks and aviation plugs.
     
    • Summary Simplified Troubleshooting Flow
     
    • 1. Reseat all cables (Power, Signal, Ribbon) → Restart devices (Signal source, Controller card, Software).
    • 2. Change cables Change signal source Bypass intermediate devices to rule out transmission issues.
    • 3. Verify Screen Parameters in the control software (Width, Height, Controller Card Model).
    • 4. Replace modules controller card to locate hardware failure.
       
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