Common problems and solutions in the use of LED display video processors
The LED video processor is the witness and key equipment for the birth, growth and maturity of the full-color LED display. Its advantages and disadvantages directly affect the display effect of the LED display. The binding of the LED video processor and the display is very convenient. It is widely used by end users and improves the depth of the use of LED displays. For users, in order to ensure efficient use, it is necessary to understand several common video processor failure solutions.
1. The LED screen cannot be displayed in full screen
Problem phenomenon: The LED screen cannot display the entire image of the input signal source, but only part of the image.
Solution:
(1) Set the “Output Width” value of the video processor to the LED screen width pixel point, and the “Output Height” value to be the same as the LED screen height pixel point.
(2) When the input signal is a computer signal, it is necessary to set the video processor to the “full screen display” state.
2. The LED screen cannot be displayed locally
Problem phenomenon: The LED screen can only display the entire image of the computer desktop, not only part of the image, “partial display” is for the LED screen to display computer signal settings
Solution:
(1) Set the video processor to the “partial display” state.
(2) Set the resolution of the computer output to be greater than or equal to the resolution of the LED screen (sometimes you need to set the computer output resolution to be the same as the video processor output resolution)
3. VGA input, screen offset
Problem phenomenon: When the VGA input signal is selected, the display screen of the LED screen is offset
Solution:
(1) Select VGA input and keep displaying VGA signal.
(2) Press the VGA AUTO button to automatically calibrate, some models need to press the VGA button first, and then press the AUTO button to start the automatic calibration.
(3) Ensure that the signal entering the VGA input port is not disturbed and the signal amplitude meets the requirements.
4. The LED screen image is displayed in the center, and the screen is not satisfied
Problem phenomenon:
(1) When selecting the computer input signal (VGA, DVI or HDMI, etc.), the processor setting is correct, but the computer desktop image is centered and displayed on the LED screen,
(2) The output resolution of the computer graphics card is set to different values, and the input resolution of the processor LCD display is a fixed value. Such as: always display 2048x1152_60Hz
Cause Analysis:
VGA, DVI or HDMI receiving ports all contain EDID data. The EDID data contains all the resolution formats that the interface can recognize and the best resolution format that can be recognized. After some computer graphics card is connected to the VGA, DVI or HDM port of the processor, the output resolution of the computer graphics card will default to the best resolution format recognized by the processor. The resolution set by the computer graphics card is only the resolution size of the effective image displayed, and it is displayed in the center.
Solution:
Change the scaling option of the VGA/DVI/HDMI output of the graphics card, and set it to scale to make the output full screen. In the work, it is found that different graphics cards, different operating systems and even different versions of the operating system have different positions in the system. We organize the detailed steps of graphics card settings under common XP and WIN7 systems as follows:
1).Win7 system NVDIA+INTEL dual graphics card notebook
Right-click on an empty space on the desktop and select “Graphics Options” → “Screen Fitting” → “Digital TV” → “Scaled Full Screen” in the pop-up menu, then the DVI signal is set to full screen output.
Right-click on an empty space on the desktop, select “Graphics Properties” in the pop-up menu, enter the Intel Graphics and Media Control Panel, under the “Display” → “General Settings” menu, select the display to display it digitally, and set the scaling option to Custom Aspect Ratio, width and height are both set to 100%.
2). Win XP system ATI graphics card
Right-click on an empty space on the desktop, select “ATI Control Panel” in the pop-up menu, then select “Digital Panel [DVI]” → “Scale Options” in the ATI Control Panel, set it to “Overscan 0%”, then DVI The signal is set to full screen output.
3). WIN7 system ATI graphics card
Right-click on an empty spot on the desktop, select “ATI Control Panel” in the pop-up menu, then select “My Digital Plane” → “Zoom Options (Digital Plane)” in the ATI Control Panel, and set it to “Overscan 0” %”, the DVI signal is set to full screen output.
5. After the graphics card is connected to the LED video processor, the sound card has no sound output
Problem phenomenon: After the computer graphics card DVI or HDMI is connected to the processor, the sound card has no sound output. When the DVI or HDMI cable is unplugged, the sound output of the sound card is normal
Reason analysis: The HDMI interface can transmit image and sound signals at the same time, and most graphics cards currently support HDMI output. Even if the DVI interface is used, the internal processing scheme of the graphics card also uses the HDMI method. Therefore, the graphics card also has a sound output function, and the computer sound can be output from the sound card or the graphics card. If the graphics card HDMI is set as the default sound output device, the computer sound will be output from the graphics card by default after the computer graphics card DVI or HDMI is connected to the processor, so the sound card has no sound output.
Solution: Set the sound card as the computer’s default sound output device. Different operating systems of the computer have different setting interfaces and methods. We take Win7, Vista and XP as examples to illustrate.
Win7 or Vista system:
(1) Right-click the speaker icon in the taskbar and select “Playback Devices”
(2) Set “Speaker” as the default sound output device
XP system:
Right-click the speaker icon in the taskbar and select “Playback Device”, select Adjust Audio Properties, and select the default device for sound playback as Realtek HD Audio output
