Have you ever faced the frustrating situation where your LED screen goes completely black or parts of it fail to display?
Screen blackouts can occur for a variety of reasons, leaving users both confused and concerned about their devices.
This post aims to provide a detailed guide on the factors behind and how to troubleshoot screen blackout issues effectively. Here we use the Novastar controller and software for demonstration, however, you can apply these principles to other LED software as well.
In This Article
Understanding the Screen Blackout
Screen blackout refers to a situation where a display loses all visual output, resulting in a dark or black screen with no lighting LED. This issue can occur due to various factors, including power failures, connection problems, or hardware malfunctions within the display system.
Generally, the screen blackouts can be categorized into two main types: full screen blackout and partial screen blackout.
- Full screen blackout occurs when the entire display is dark, leaving no visual output.
- Partial screen blackout happens when only specific sections or panels of the display lose their functionality.
Understanding Receiving Card Indicator Status
Before diving into the screen blackout issues, it’s essential to comprehend the receiving card indicator status. Different indicator statuses provide valuable insights that can guide the troubleshooting process. Here’s a breakdown of the various statuses:
1. Working Normally
- Indicators: Red light solid, green light flashing once per second.
- Meaning: The receiving card is functioning properly. If your screen is black in this state, the issue lies elsewhere in the system.
2. Working Normally, But in Backup Mode
- Indicator Status: The red indicator light is solid, but the green indicator light flashes four times in half a second, waits half a second, then repeats.
- Meaning: The receiving card is operating in backup mode.
3. Network Cable Not Connected
- Indicators: Red light solid, green light flashing every five seconds.
- Meaning: There is no network connection. Verify that the cables are securely connected and functioning.
4. No Signal Input
- Indicators: Red light solid, green light flashing three times every half second.
- Meaning: The video source is not being detected. Check video cables and the source device.
LED Screen System Structure
Once we understand the indicator statuses, it’s crucial to revisit the LED screen system structure to identify the root cause of the blackout.
As shown in the following image, the standard LED display control system consists of several components, including a control PC, sending card, video processor, LED screen, receiver card, hub board, LED display modules, Ethernet cables, data flat cables, video cables, etc.
Any of these hardware elements or associated programs could contribute to a blackout issue, no matter it is a stage rental LED display or a Commercial LED video wall. Let’s begin by addressing the full screen blackouts.
Common Causes of Full Screen Blackout
As shown in the following image, there are 6 main causes of the full display blackout.
1. Screen Power
Before proceeding with any troubleshooting, ensure that the screen is powered on and that the power supply is sufficient.
- Cause: The screen power is turned off or inadequate.
- Solution: Ensure the screen power is turned on and adequate.
2. Brightness Value
If your screen utilizes the Novastar controller, try adjusting the brightness or switching the screen control back to normal mode to determine if the display is functioning correctly. Because the brightness may be set to zero or the screen control might be in blackout mode.
- Cause: The brightness value may be set to zero, or the screen may be in blackout mode.
- Solution: Adjust the brightness or change the screen control to normal mode.
3. Ethernet Cable
- Cause: The Ethernet cable may be loose or faulty.
- Solution: Reconnect or replace the Ethernet cable.
4. LED Sending Card
We also need to inspect the sending card. First, verify that the sending card is powered on and that the power supply is adequate. Next, check if you have selected the correct input source; for instance, if the LED screen requires an HDMI input but the DVI source is selected, the screen will remain black. Lastly, examine the input source interface for any faults or damages; consider swapping it with another sending card or using a different interface if necessary.
- Cause: Issues with the sending card power, input source selection, or input source interface.
- Solution: Check the sending card power, ensure the correct input source is selected, and inspect the input source interface for faults.
5. Video Source
We also need to evaluate the video source. First, check the graphic card to ensure it is set to normal mode; if it isn’t, try switching to a different video source. You can test with another computer to see if the issue persists. Next, inspect the cable connections and consider reconnecting or replacing the cables such as HDMI, DVI, SDI, etc. Finally, check for compatibility issues; non-standard video sources may not be fully compatible with the controller, which could cause problems.
- Cause: Problems with the graphic card, video cable, or compatibility issues.
- Solution: Verify the graphic card settings, reconnect or replace the video cable, and check for compatibility issues.
6. Receiver Card
Finally, it’s essential to examine the receiving card. Two key factors to assess are the configuration file and the firmware. Incorrect configuration files or outdated firmware can result in blackout issues. Make sure to load the correct or original configuration file, or recreate it if necessary.
- Cause: Incorrect configuration file or firmware program.
- Solution: Load the correct configuration file and upgrade the firmware from the official website.
For the configuration file, note that if you are using the Linsn controller, it will be an RCG file. If you are using the Colorlight controller, it will be an RCVBP file, and for the Novastar controller, it will be an RCFGX file. You can download these relevant files at the end of this post.
Step-by-Step Troubleshooting for Full Screen Blackout
Now that we have identified the potential factors contributing to the blackout, let’s delve into a step-by-step troubleshooting process for full screen blackouts.
First, we need to examine the indicators on the receiver card. If the red indicator light is off, check and replace the power supply. If the red light is on, next, evaluate the green indicator lights. Based on the status of the green lights, investigate the corresponding device:
- If the green light flashes very slowly (once every five seconds), check the sending card and the Ethernet cable.
- If it flashes quickly three times with a 0.5-second interval, inspect the video source input.
- If the green light flashes normally (once per second), focus on the receiving card or adjust the brightness settings.
Please note that the above indicator status is based on the Novastar Receiver card, other brand LED receiver cards will have a similar working principle.
By following these steps, you should be able to pinpoint the cause of the blackout.
Common Causes of Partial Screen Blackout
After addressing the full screen blackout, let’s now focus on the issue of partial screen blackouts.
Part of screen blackout is similar to full screen blackout issue, it can occur at different levels: sending card output port, cabinet, or LED module. Here’s how to troubleshoot each level:
1. Sending Card Output Port Level
In this case. First, ensure that the power supply to the specific output port is functioning properly; if not, consider replacing or reconnecting it. Next, inspect the Ethernet cable for any looseness or damage, and replace it if necessary. Lastly, check the sending card itself to confirm that the output port is working correctly. If issues persist, consider switching to a different output port or replacing the sending card.
- Cause: Power fault in the first cabinet connected to the output port, loose or faulty Ethernet cable, or a faulty sending card output port.
- Solution: Check and replace the power supply, reconnect or replace the Ethernet cable, and test the sending card output port.
2. Cabinet Level
After examining the sending card output port level, the next step is to check the cabinet level. If a cabinet is completely black, begin by inspecting its power supply unit for faults, and consider replacing it with a functional unit. Next, check the Ethernet cable for any looseness or damage; if issues are found, reconnect or replace the cable.
Then, evaluate the receiver card within the cabinet, focusing on three key areas: the configuration file, firmware, and hardware. For the configuration file, try loading the correct or original version, or recreate it as needed. For firmware, ensure it is updated to the latest version from the official website. If there are hardware faults, replace the receiver card to see if the problem persists. Lastly, check the hub board for any issues and consider replacing it if necessary.
- Cause: Power supply unit fault, loose or faulty Ethernet cable, receiver card issues (configuration file, firmware, hardware), or hub board fault.
- Solution: Replace the power supply unit, reconnect or replace the Ethernet cable, load the correct configuration file, upgrade the firmware, replace the receiver card, or change the hub board.
4. LED Module Level
Faults in LED modules can also lead to partial screen blackouts. Start by checking the power supply that drives the LED modules for any issues, including loose power cables; replace the power supply or cable if necessary.
Next, inspect the flat data cable connected to the modules for looseness or damage, and reconnect or replace it if needed. Lastly, examine the hub board connector for any faults, and consider switching to different connectors or replacing the hub board altogether if problems persist.
- Cause: Power supply fault, loose or faulty data cable, or hub board connector fault.
- Solution: Replace the power supply, reconnect or replace the data cable, and test the hub board connectors.
Step-by-Step Troubleshooting for Partial Screen Blackout
The factors mentioned above could contribute to partial screen blackouts. To effectively diagnose and resolve the issue, follow this step-by-step process:
First, Determine if the problem originates from the sending card output port, cabinet, or LED module.
Sending Card Output Port
- If the blackout occurs on a specific output port, try switching to another output.
- If the issue persists with the new output, check the Ethernet cable and replace it if necessary.
- If the problem remains even after changing the Ethernet cable, examine the cabinet power supply and sending card.
Cabinet Level
- For blackouts occurring in a specific cabinet, check the power supply, Ethernet cable, receiver card firmware, and configuration file.
- If the issue continues, replace the suspected receiver card with a functioning one. If the problem is resolved, the original receiver card is faulty. If the issue persists, investigate potential cabinet hardware faults or hub board issues.
LED Module Level
- If the blackout affects a specific LED module, check the power supply, flat data cable, and hub board socket for issues.
Summary
In this guide, we explored the intricacies of troubleshooting screen blackout issues by examining the receiving card indicator statuses and analyzing the diverse causes for both full screen and partial blackouts. By assessing each component methodically—from power supplies to cables and cards—you can pinpoint problematic areas efficiently.
For any problems, you can contact us at any time for tech support if your screen remains blackout even if you have followed all the above steps. For more LED display tutorials, check here.
Userful Resource
To troubleshoot screen blackout quickly, first, you need to ensure the LED screen connection is correct. Here is a full guide: Comprehensive Guide to LED Display Connection.
Also, we have collected the latest firmware program and configuration files if you need to upgrade.
Firmware Download
In the meantime, you can follow this Novastar Firmware Upgrade Step-by-Step Guide to upgrade the firmware if you are using the Novastr controller to control the screen. You can also follow this guide: How to Upgrade Firmware of Colorlight LED Receiver Card if you are using Colorlight Controller to configure the screen.
Configuration File Download
After downloading the config files, you can follow the tutorial: Complete Guide to Configuration Files for Colorlight Receiver Card to update the file to Colorlight LED receiver cards.