10 Methods for Troubleshooting LED Display Issues

Indoor led displays

10 Methods for Troubleshooting LED Display Issues

LED display problems can indeed pose challenges for user. However, We should overcome these challenges. Let’s explore 10 methods to resolve common LED display issues.

Table of Contents

10 Methods for Troubleshooting LED Display Issues

1. Display Not Working; Sending Card Green Light Flashing (Pulsing)

Causes:

No power supply to the display panel.
Loose or faulty network cable connection.
Receiving card lacks power or has insufficient voltage (below 5V).
Defective sending card.
Signal transmission devices (e.g., function cards, fiber converters) are improperly connected or faulty.

Solutions:

Verify the LED display panel is properly powered.
Reconnect or replace the network cable.
Ensure the DC power output to the receiving card is stable (5–5.2V).
Replace the sending card.
Check connections or replace faulty intermediate devices (e.g., function cards, fiber converters).

2. Display Not Working; Sending Card Green Light Not Flashing

Causes:

Loose or damaged DVI/HDMI cable.
Graphics card settings not configured to “Duplicate” or “Extend” mode.
Software settings have disabled the display power.
Sending card is improperly seated or defective.

Solutions:

Inspect and secure the DVI/HDMI cable connection.
Adjust graphics card settings to “Duplicate” mode.
Enable the LED display power via software.
Re-seat or replace the sending card.

3. Error Message: “Large Screen System Not Detected” During Startup

Causes:

Serial/USB cable disconnected from the sending card.
Damaged COM/USB port on the computer.
Faulty serial/USB cable.
Defective sending card.
Missing USB driver installation.

Solutions:

Reconnect the serial or USB cable to the sending card.
Use a different computer or repair the port.
Replace the serial/USB cable.
Replace the sending card.
Install the latest software version or USB driver separately.

4. Vertical Strip (Same Height as Light Board) Not Displaying, Partial Display, or Missing Colors

Causes:

Loose, disconnected, or damaged flat ribbon cable or DVI cable (for Submarine series).
Faulty output from the preceding light board or input at the connection point.

Solutions:

Reconnect or replace the ribbon/DVI cable.
Identify the faulty LED module at the connection and replace/repair it.

5. Partial Modules (3–6 Modules) Not Displaying

Causes:

Power supply protection triggered or power supply damaged.
Loose AC power cable connection.

Solutions:

Test and confirm the power supply functions properly.
Reconnect the AC power cable securely.

6. Entire Cabinet Not Displaying

Causes:

Loose or disconnected 220V power cable.
Faulty network cable transmission.
Damaged receiving card.
HUB board improperly seated.

Solutions:

Inspect and secure the 220V power connection.
Replace the network cable.
Replace the receiving card.
Re-seat the HUB board correctly.

7. Full-Screen Distortion, Flickering, or Image Tearing

Causes:

Incorrect driver configuration loaded.
Network cable between computer and display is too long or low quality.
Defective sending card.

Solutions:

Reload the receiving card driver configuration.
Shorten the network cable or use a high-quality shielded cable.
Replace the sending card.

8. All Display Units Show Identical Content

Causes:

Display linking configuration file not properly sent to the system.

Solutions:

Reconfigure and send the display linking file. Ensure the computer’s network cable is connected to the sending card’s output port closest to the indicator light during transmission.

9. Low Brightness or Blurred Image on Display

Causes:

Sending card software configuration error.
Incorrect function card settings.

Solutions:

Restore the sending card’s default settings and save changes.
Adjust the display’s minimum brightness setting to 80 or higher in the monitoring software.

10. Full-Screen Flickering or Ghosting

Causes:

Faulty communication cable between the computer and display.
Loose or damaged DVI cable connecting the multimedia card to the sending card.
Defective sending card.

Solutions:

Reconnect or replace the communication cable.
Reseat and secure the DVI cable connection.
Replace the sending card.

By mastering these ten common issues and solutions, you’ll be well-equipped to handle unexpected LED display issues with confidence.

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