FAQs - Mooncell - Professional LED Display Control System Expert

FAQs

Q

.LED screen displaying black screen.

A

Possible Causes:
1. Partial module black screen: Possible module damage, malfunction of power chip.
2. Possible issues with the adapter board interface.
3. Possible malfunction of the receiving card, abnormal display of power/signal lights.
4. Malfunctioning sending card network port, no image output.

Troubleshooting Steps:
1. Replace (repair) the module; swap modules to isolate and repair faults.
2. Replace the adapter board or repair problematic interfaces.
3. Swap receiving cards to confirm faults; replace receiving cards.
4. Swap sending card network ports to confirm faults; replace sending cards.

Additional Possible Causes:
1. Partial module black screen may be caused by calibration activation.
2. Possible power failure or loose power terminal wire connection.
3. No signal from the front-end video source.
4. Receiving card brightness set to 0.

Further Troubleshooting:
1. Disable calibration (if calibration is activated without calibration values, the system will send data with a value of 0 to the screen, resulting in a black screen).
2. Check or replace the power supply.
3. Detect sending card signal or swap DVI cables to confirm video source status.
4. Screen control - adjust brightness values for all channels.

Additional Possible Causes:
1. Poor network cable connection.
2. If black screen occurs by network port unit, it may be due to network port communication issues.
3. If black screen occurs by cabinet unit, partial cabinets have black screens, it may be due to unstable connection between cabinets or faulty cables or network ports.
4. Possibly inappropriate version number of the receiving card’s program in the cabinet.

Further Troubleshooting:
1. Detect receiving card information and check network communication status; plug and unplug network cables.
2. Check if the receiving card in the cabinet blinks. Try replacing the receiving card. If it does not blink, it’s a cable issue; if it blinks, it’s a corresponding sending card network port issue.
3. Check if the receiving card in the black screen cabinet blinks. Determine the fault location based on blinking and non-blinking positions. Replace cabinet receiving cards or cables.
4. Check hardware/software version consistency, detect receiving cards, and upgrade to a unified program version.

Additional Possible Causes:
1. If black screen occurs only on one or two cabinets, it may be caused by receiving card faults.
2. If black screen occurs on a module basis, it may be due to poor cable connection/module or cable interface pin damage.
3. Possible power line failure.
4. Cable connected to the output port (common mistake for installation beginners).

Further Troubleshooting:
1. Swap suspected faulty receiving cards with those displaying normal operation. If anomalies persist with the receiving card’s movement, it indicates receiving card faults (without other parameter settings issues). Replace receiving cards.
2. Replace cables or modules.
3. Check or replace power lines, swap modules.
4. Check the input and output interface markings on the modules.
Q

Screen displaying pixelation.

A

Possible Causes:
1. Possible malfunction of corresponding modules.
2. Overload on the receiving card, confirming loading capacity (T6/FPGA).
3. Cable interference.
4. Electromagnetic interference (often observed with magnetically attached modules).

Troubleshooting Steps:
1. Swap modules to isolate the issue.
2. Add a receiving card.
3. Length exceeding 1.2 meters is prone to issues.
4. Separate the affected module from the metal framework.

Additional Possible Causes:
1. Cable or network line issues.
2. Network port controlling area overload.
3. Incorrect screen parameters on some receiving cards.
4. Malfunctioning sending card.

Further Troubleshooting:
1. Replace or swap cables or network lines.
2. Check the network port controlling area, resend the screen splicing program, and ensure consistency in width and height loading.
3. Verify consistency in screen parameters.
4. Replace malfunctioning sending card network ports.

Additional Possible Causes:
1. Possible mismatch in receiving card programming leading to pixelation.
2. Network port or sending card loading exceeding maximum capacity.
3. If pixelation is observed in only a few screens, it may indicate receiving card faults.
4. For screens that have undergone calibration, disabling calibration may restore normal operation, indicating potential loss of calibration coefficients.

Further Troubleshooting:
1. Inspect receiving cards, check programming, and upgrade to correct receiving card programs.
2. Calculate the loading for each network port or sending card. If exceeding 650,000 pixels or the sending card loading, consider modifying network connection schemes or using sending cards with larger load capacities. If unsuccessful, use software for pixel compression.
3. Swap suspected faulty receiving cards with those displaying normal operation. If anomalies persist with the receiving card’s movement, it indicates receiving card faults necessitating replacement.
4. Locate backup coefficients for re-transmission or disable calibration. Avoid using calibration coefficients for the entire screen.

Additional Possible Causes:
1. If issues occur within a single sending card’s range, investigate possible front-end signal delivery issues (hardware DVI port problems).
2. Pin damage leading to data group pixelation.

Further Troubleshooting:
1. Swap signal lines and outputs with other functional sending cards. If issues persist with hardware movement, it indicates hardware faults requiring replacement.
2. Replace interfaces, receiving cards, or adapter boards.
Q

Partial flickering observed on the LED screen.

A

Possible Causes:
1. Potential overuse of refresh rate parameters.
2. Elevated data clock or grayscale clock settings.
3. Damage to module or adapter board interfaces.
4. Malfunctioning receiving card.

Troubleshooting Steps:
1. Lower the refresh rate and adjust clock settings.
2. Decrease data and grayscale clock frequencies.
3. Replace (or repair) damaged modules or adapter board interfaces.
4. Swap receiving cards to isolate and replace faulty components.

Additional Possible Causes:
1. Defective receiving card programming.
2. Presence of error rates.
3. Faulty sending card operation.
4. If issues occur within a single sending card’s range, investigate possible front-end signal delivery issues.

Further Troubleshooting:
5. Install compatible program updates for receiving cards.
6. Verify error rates and inspect cable connections / soldering on adapter boards.
7. Investigate and replace malfunctioning sending card network ports.
8. Swap signal lines and outputs with other functional sending cards. If issues persist with hardware movement, it indicates a hardware fault necessitating replacement.

Additional Possible Causes:
9. Occurrence of flashing spots on specific modules of a single card.
10. Improper installation of receiving cards causing contact with steel structures.
11. Poor wiring connections.
12. Voltage instability in the power supply.

Further Troubleshooting:
9. Adjust parameter data clock phase settings.
10. Verify correct installation of receiving cards and consider adding protective materials behind them.
11. Replace malfunctioning sending card network ports.
12. Check power supply voltage output stability and replace with a new unit if necessary.
Q

Image blur and not displayed in pixel-to-pixel mode.

A

Possible Causes:
1. Incorrect resolution setting on the sending card.
2. Compression processing is applied to the screen connection program.
3. Scaling is performed on the computer’s graphics card.
4. Resolution mismatch between the sending card and the computer monitor in duplicate mode.

Troubleshooting :
1. Adjust the resolution setting on the sending card to match the input signal resolution.
2. Use a program that does not compress the signal.
3. Adjust the scaling setting on the computer’s graphics card to 100%.
4. Set the resolution on the sending card to match the monitor resolution.

Additional Possible Causes:
1. Front-end processor applied scaling.
2. Video source resolution is too low and not pixel-to-pixel.

Additional Troubleshooting Steps:
1. Adjust the processor to output in pixel-to-pixel mode.
2. Replace with a high-definition video source.
Q

Some LED display panels lag behind by a few frames.

A

Possible Causes:
1. Inconsistent firmware versions on the receiving cards.
2. Asynchronous video feed from the front-end processor to different sending cards.
3. Different hardware versions of the receiving cards.

Troubleshooting :
1. Upgrade the firmware on all receiving cards to a consistent version.
2. Seek assistance from the processor manufacturer to debug the asynchronous video feed.
3. Replace the receiving cards with consistent versions.
Q

Possible causes for not detecting the receiving card？

A

Possible Causes:
1. The Ethernet cable is too long.
2. Damage to the Ethernet port of the receiving card.
3. Possible malfunction of the Ethernet port on the sending card.
4. The software version may be too high for the receiving card hardware version.

Troubleshooting :
1. Replace the Ethernet cable with a Category 5 cable of length less than 100 meters.
2. Replace the receiving card to investigate hardware issues.
3. If swapping the cable to another port detects the receiving card, it confirms a port issue. Replace the sending card or select another port.
4. Use an older version of the software for detection.
Q

Unable to detect the receiving card.

A

Possible Causes:
1. Poorly connected Ethernet cable (or damaged/poor quality cable).
2. Receiving card lacks programming.
3. Receiving card has programming but no signal.
4. Issues with the interface port of the adapter board.

Troubleshooting :
1. Ensure the Ethernet cable is properly connected (replace with a good-quality cable if necessary).
2. Program the receiving card or replace it with a programmed one.
3. Replace the receiving card.
4. Repair or replace the interface port of the adapter board.
Q

Inconsistent brightness efficiency of the module configuration file.

A

Possible Causes:
1. Program issues with the receiving card.
2. Different brightness efficiency of the module configuration files.

Troubleshooting :
1. Restore factory settings in the software.
2. Adjust the program to a uniform brightness efficiency.
Q

Inconsistent brightness of the receiving card.

A

Possible Causes:
1. Inconsistent versions of the receiving card program.
2. Different brightness values of the receiving card.
3. Different gamma values of the receiving card.
4. Hardware problems with the receiving card.

Troubleshooting :
1. Upgrade to a unified version of the program.
2. Resend the brightness values of the receiving card in the software.
3. Resend the gamma values in the software.
4. Replace the receiving card.
Q

Not all receiving cards are detected, but the screen displays normally.

A

Possible Causes:
1. The program of the undetected receiving card is different from the program of other cards.
2. There is a problem with the network cable, and the error rate is very high.
3. Incorrect software version.
4. Mixing T6 and FPGA cards.

Troubleshooting :
1. Upgrade the program to be the same.
2. Replace with a good network cable.
3. Download the latest software from the official website(www.mooncelltech.com)
4. Separate the T6 card and FPGA card for debugging and saving.
Q

When displaying a black color on the LED screen, there is a slight brightness in the background.

A

Possible Causes:
1. Output problem with the graphics card.
2. Issue with the video cable.
3. Problem with the input port of the sending card.

Troubleshooting :
1. Adjust the grayscale of the graphics card to complete (0-255).
2. Replace the video cable.
3. Replace the sending card to confirm the issue.
Q

The 2IN1 processor displays a black screen while reading from the USB flash drive.

A

Possible Causes:
1. Firmware program issue with the processor.
2. Video resolution exceeds 1080P.
3. Incorrect video format.
4. USB flash drive is not formatted as FAT32.

Troubleshooting :
1. Update the processor with the latest firmware.
2. Use video format conversion software to lower the video resolution.
3. Convert the video to MP4 format using video format conversion software.
4. Format the USB flash drive and change the format to FAT32.

Additional Issue:
1. The USB flash drive has two partitions, with one being a system partition.
2. The USB flash drive is connected via a 3.0 interface.

Additional Troubleshooting :
1. Format the USB flash drive and merge it into a single partition.
2. Replace the USB flash drive with one that uses a 2.0 interface.

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