Typically, the control system architecture connects the control computer via serial and video cables to the sending card, which in turn connects to the LED screen via a network cable. The screen itself consists of the receiving card, hub, flat cables, and power connections. Therefore, at the initial stage of troubleshooting, we must determine the likely cause of the problem and which part of the control system is involved.
1. Display Screen Control: When an LED display malfunctions, we can first use the screen control to send a freeze or solid color screen command to observe the screen's fault status. This is because the screen control signal comes directly from the receiving card itself, similar to the cabinet's self-test button.
If the screen fault disappears in the current freeze state, we can generally conclude that the problem is not related to the receiving card, and we can simply check the system link before the receiving card.
2. Cabinet (Receiving Card) Green Status Indicator: The receiving card's green status indicator is the "barometer" of the display's operating status, letting you know at a glance if there are any problems with the screen! Different flashing states indicate different information, such as backup status, no input source signal, or a disconnected network cable.
When we've been able to initially identify the possible causes of the problem and have obtained some fault information from the display, but still can't pinpoint the ultimate cause, we need to begin a detailed analysis and "operation.
01. Seeking Commonalities: Whenever normal and abnormal phenomena coexist on-site, we need to identify differences and seek commonalities. Find the differences and unify them. For example, if there are inconsistencies in configuration files or firmware, we can read back from the normal area and apply them to the abnormal area to ensure consistent general information and settings, narrowing the scope of the troubleshooting.
02. Cross-Validation: If finding commonalities and seeking commonalities still doesn't work, we can continue cross-validation. Swap the device or connection in the problem area with another device in a normal area to observe whether the problem symptoms shift with the swap, thereby narrowing the scope of the problem.
03. Controlling Variables: When performing cross-validation, we must ensure that the variable we are validating is unique. Don't try to fix the problem in a haphazard manner. This will waste time and delay the process. Only changes brought about by a unique variable are valuable and provide a strong basis for diagnosing the problem.