The following are common fault detection and troubleshooting methods for LED large screen control cards:
I. Reverse Cable Connection Faults
Fault Symptom: After connecting the control card and the display screen and powering on, pressing the test button will cause abnormal display if the connection is incorrect, such as displaying abnormal patterns (abnormal stripe display, etc.). With a normal connection, the display screen should display a specific normal image. When the connection is incorrect, the display screen will show something similar to the following:
Detection Method: Power on the screen and press the test button, observe the display screen's image, and compare it with the normal display image to determine if the problem is a reversed cable connection.
Solution: Connect the cables to the screen row by row from top to bottom. Observe the display screen's display while connecting each row. Confirm that the row displays normally before connecting the next row, until the normal test image, such as diagonal stripes, is displayed.
II. Control Card Automatic Restart Fault
Fault Symptom: After the screen is connected and powered on, it only plays part of the program before stopping and then restarting.
Detection Method: Observe the screen's playback. If a loop of stopping and restarting midway through playback occurs, it can be preliminarily determined to be a control card automatic restart fault.
Cause of the fault: The main reason is insufficient power supply, causing the control card to fail to operate stably and automatically restart.
Solutions:
Reduce brightness: Adjusting the display brightness settings reduces overall power consumption and lessens the burden on the power supply, potentially resolving the control card's automatic restart issue caused by insufficient power.
Reduce load: Reduce the number of unit boards the power supply connects to the control card by two, decreasing the power supply load and ensuring a stable power supply to the control card and remaining unit boards.
Add power supply: If the above methods fail, consider adding a power supply to increase overall power capacity and ensure the control card and display receive sufficient power for stable operation.
