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The typical application of the video processor in the LED large-screen system is shown in Figure 1. 
Figure 1 Typical use of video processors
Users have encountered problems during the installation and debugging of the video processor. Please follow the steps below to repair:
The processor does not respond to power-on
Phenomenon: The LCD screen is not lit, the button does not respond, and the image has no output.
Whether the processor is powered on
220V power cord has been inserted
Front panel switch hits the open position
Is the 220V power supply seat normal?
Large screen display is not normal
No processor
Disconnect the DVI connection between the graphics card and the processor input
Disconnect the DVI connection between the processor output and the sending card
Connect the DVI of the graphics card directly to the DVI port of the sending card.
If you do not use the processor large screen is normal, then the problem appears on the processor;
Check the output of the processor
Connect the VGA output of the processor to the monitor
If the monitor shows normal, it means the DVI output is not normal or the sending card is not powered. Next, check the DVI output cable. If there is no problem with the cable, consider returning to the factory for repair.
If the monitor connected to the VGA is not displayed, check the input of the processor.
Check processor input
Is the computer graphics card set to copy mode?
DVI connection cable is no problem
If there is a notebook, connect the VGA output of the notebook to the VGA input of the video processor, and switch to the VGA channel on the front panel to see if the VGA channel is normal.
If there are DVDs or cameras, connect their composite video signal CV to the CV1-3 of the video processor to see if it is normal.
If all input sources do not have an image signal output, consider returning to the factory for repair.
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