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Common Solutions for LED Display Video Processor Issues
Release time:2023-11-29

"The full-color LED display video processor encapsulates the developmental journey of the full-color LED display from its inception to maturity, standing as a witness and pivotal apparatus in its holistic evolution. As a pivotal component directly influencing the display effect of LED screens, the integration of the LED display video processor with the screen enables extensive utilization by end-users, thereby enhancing the quality and depth of application for LED displays. To ensure a highly efficient user experience, understanding common troubleshooting methods for video processors becomes paramount. Here are a few common issues encountered during the debugging process, presented here for ease of identification and resolution."

1. The LED screen fails to display in full screen.

Issue: The LED screen cannot exhibit the entire image from the input signal source and only shows a portion of it.

   Resolution:Set the output width value of the video processor to match the width pixel count of the LED screen; set the output height value to correspond to the height pixel count of the LED screen.

When the input signal is a computer signal, ensure that the video processor is set to "full-screen display" mode.

2. The LED screen cannot display partially.

 Issue: The LED screen can only exhibit the complete image of the computer desktop and fails to display all images. "Local display" is the computer signal display setting for the LED screen.

Resolution:Set the video processor to the local display status.

Adjust the computer output resolution to be greater than or equal to the LED screen resolution (in some cases, the computer output resolution should be set equal to the output resolution of the video processor).

3. VGA input, screen offset.

Issue : When selecting VGA input signal, the LED screen displays an offset.

Resolution:Select the VGA input and continue displaying the VGA signal.

Press the VGA AUTO key for automatic correction. For certain models, initiate automatic correction by pressing the VGA key first, followed by the AUTO key.

Ensure the signal entering the VGA input port remains undisturbed and that the signal width meets the requirements.

4. LED screen image centered display, unsatisfactory screen.

Issue Description:

  1. When selecting computer input signals (VGA, DVI, or HDMI, etc.), with correct processor settings, the computer desktop image appears at the center of the LED screen.

2. If the output resolution of the computer graphics card differs, the input resolution for the processor's LCD screen remains fixed. For instance, it consistently displays 2048x1152_60Hz.

Analysis of the Cause:

The VGA, DVI, or HDMI input ports contain EDID (Extended Display Identification Data), which includes information such as all resolution formats recognizable by the interface and the identification of optimal resolution formats. When certain computer video cards are connected to the VGA, DVI, or HDMI ports of the processor, the output resolution of the computer video card defaults to the optimal resolution format recognized by the processor. The resolution set on the computer's graphics card represents the size of the effectively displayed image, centered on the screen.


Adjust the scaling options for the VGA/DVI/HDMI output of the graphics card to scale for full-screen output. It's noted that different graphics cards, operating systems, and even the positioning within the system can vary. Detailed configurations for graphic settings on typical XP and WIN7 systems have been thoroughly compiled.

1) For Win7 system with NVIDIA and Intel dual graphics card laptop:

- Right-click on an empty space on the desktop, select "Graphics Options," then choose "Fit to Screen," "Digital Television," and "Full Screen Zoom" from the pop-up menu. This will configure the DVI signal for full-screen output.

- Right-click on an empty area of the desktop, select "Graphics Properties," go to the Intel Graphics and Media Control Panel, choose the Display Digital Display option from the Display General Settings menu, set the scaling option to custom aspect ratio, and set both width and height to 100%.


2) For Win XP system with ATI graphics card:

- Right-click on an empty space on the desktop, select "ATI Control Panel." Within the ATI Control Panel, choose "Digital Panel [DVI]" and navigate to the "Scaling Options." Set it to "Overscan 0% or above," which will configure the DVI signal for full-screen output.

3) For Windows 7 system with ATI graphics card:

- Right-click on an empty space on the desktop, select "ATI Control Panel."

- Within the ATI Control Panel, choose "My Digital Flat-Panels" and then "Scaling Options (Digital Flat-Panel)."

- Set it to "Overscan 0% or above," which will configure the DVI signal for full-screen output.

5.After connecting the graphics card to the LED video processor, there is no sound output from the sound card.

Issue symptoms: When the computer's DVI or HDMI graphics are connected to the processor, there is no audio output from the sound card. However, once the DVI or HDMI cables are unplugged, the sound output from the sound card returns to normal.

Analysis of the cause: HDMI ports can simultaneously transmit both image and audio signals, and most graphics cards currently support HDMI output. Even when using the DVI interface, the internal processing of the graphics card may utilize HDMI protocols. Hence, the graphics card also possesses audio output capabilities. The computer's sound can be routed to output from either the sound card or the graphics card. If the HDMI setting on the graphics card is configured as the primary audio output device, when the computer's graphics card DVI or HDMI is connected to the processor, the computer's audio defaults to output through the graphics card. Consequently, there is no audio output from the sound card.

Solution: Set the sound card as the default audio output device for the computer. Different computers have varying interface and methods for operating system settings. I'll provide instructions for Win7, Vista, and XP as examples.


For Windows 7 or Vista:

1. Right-click on the speaker icon in the taskbar and select "Playback devices."

2. Set the speakers as the default audio output device.


For XP:

Right-click on the speaker icon in the taskbar, select "Playback devices," choose "Adjust audio properties," and select Realtek High Definition Audio Output as the default device for sound playback.

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