LED large screen is an electronic device that may experience various malfunctions from time to time. Based on their field experience, the maintenance engineers at Lehman Kangshuo have summarized five common faults and their solutions for LED display screens.
**First, why is the entire screen dim or not bright?**
1. Visually check if the power cable, 26P cable between unit boards, and the power module indicator are functioning properly.
2. Use a **multimeter** to measure the voltage on the unit board and confirm that the output voltage of the power module is normal. If not, the power module might be faulty.
3. If the voltage from the power module is low, adjust the fine-tuning potentiometer near the indicator light to bring the voltage up to the standard level.
**Second, what causes the LED screen to go completely black?**
A black screen can occur due to multiple reasons, such as improper power supply, loose cables, or communication issues. For example, the screen may go black during startup, while loading content, or after sending data. To troubleshoot:
1. Ensure all hardware components, including the control system, are correctly powered (check 5V and polarity).
2. Check if the serial cable connecting to the controller is loose or damaged. If the screen goes black during loading, it’s likely due to a communication interruption. Make sure the cable is securely connected.
3. Confirm that the LED screen and HUB distribution board are properly connected and inserted into the main control card.
**Third, why isn’t the screen loading or communicating?**
Communication and loading failures can have different causes. Here’s how to check:
1. Verify that the control system is receiving proper power (5V).
2. Ensure the serial cable used is a straight-through type, not a crossover cable.
3. Check that the serial port cable is intact and not loose at either end.
4. Make sure the LED control software matches the selected control card model, transmission mode, serial port number, and baud rate. Also, set the DIP switches according to the provided diagram.
5. Check if any jumper caps are loose or incorrectly positioned.
6. If the issue persists, use a multimeter to test the serial port for damage and consider contacting the manufacturer for further assistance.
**Fourth, why does the screen show bright lines or flicker when powered on?**
After connecting the controller, HUB board, and screen, provide 5V power to the controller (do not connect directly to 220V). At power-on, a few seconds of bright lines or a “flower screen†effect may appear. This is a normal self-test process and should disappear within 2 seconds, after which the screen will enter normal operation.
**Fifth, what is automatic or manual brightness adjustment?**
Brightness adjustment refers to the process of setting the screen's brightness between its darkest and brightest levels, not about increasing sensitivity. Automatic brightness adjustment is handled by the LED control system, which adjusts the screen's brightness based on ambient light conditions throughout the day. Manual brightness adjustment allows users to control the screen's brightness directly through the control system.
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2) Each unit can counter up to 3 frequency bands simultaneously, each frequency band is separate and with adjustable power from max to off (0).
3) 100% safe VSWR over protection (isolator) for each modular.
4) Big aluminum alloy shell and cooling fans, not-stop to work.
5) IP54 Design for outdoor installation, Secure design to avoid sabotage.
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