Damage to the LED receiving card may indeed cause the screen to fail to display, but a comprehensive troubleshooting combined with the power supply, flat cables and other links is required. The specific analysis is as follows:
Direct Correlation Between Receiving Card Failure and No Screen Display
As the core component of LED display signal transmission, the receiving card is responsible for decoding the image data output by the sending card and distributing it to each display module. If the receiving card is damaged, it may cause signal interruption or data errors, leading to a black screen or abnormal display of the screen. For example, when the sending card's green light flashes but the screen has no display, the possible reasons include insufficient power supply to the receiving card (e.g., low voltage caused by power module failure) or physical damage to the receiving card itself. In addition, the "signal disconnection" problem found in maintenance practice is often directly related to the receiving card failure, which needs to be located by replacing the receiving card or detecting its output signal.
Related Links to Be Troubleshooted
Although the receiving card failure is a common cause, the no screen display may be caused by problems in multiple links, requiring systematic troubleshooting:
• Power supply system: The receiving card requires a stable voltage supply (usually 5V or 12V). Insufficient or fluctuating output voltage of the power module may cause the receiving card to fail to work normally, manifested as a black screen or flickering of the screen.
• Signal transmission path: Loose, broken or poor contact of the flat cable connection between the receiving card and the display module will interrupt signal transmission. For example, when a module has no signal input, the connection state of the flat cable input end should be checked first.
• Sending card and software configuration: Sending card failure or incorrect control software parameters (e.g., improper resolution and refresh rate settings) may also cause no screen display, which needs to be ruled out by replacing the sending card or resetting the software configuration.
