1. Display inactive, green light of sending card flashes

1. No power supply to the screen body
2. Network cable loose connection
3. No power or insufficient voltage for receiving card
4. Damaged sending card
5. Connection failure or faults of intermediate signal transmission devices (function card, fiber transceiver box)

1. Verify normal power supply of the screen
2. Reconnect the network cable firmly
3. Ensure DC power output meets standard voltage
4. Replace the sending card
5. Check or replace faulty function card and fiber transceiver box

2. Display inactive, green light of sending card off

1. Loose DVI/HDMI cable connection
2. Incorrect graphics card or extended display mode settings
3. Large screen power disabled in control software
4. Improperly inserted or defective sending card

1. Inspect DVI cable connectors
2. Reset display mode parameters
3. Enable large screen power in software
4. Reinsert or replace the sending card

3. Prompt: Large screen system not found on startup

1. Disconnected serial/USB cable and sending card
2. Damaged PC COM or USB port
3. Defective serial/USB cable
4. Broken sending card
5. Uninstalled USB driver

1. Reconnect serial cable tightly
2. Try another computer device
3. Replace faulty serial cable
4. Change the sending card
5. Update software or install USB driver separately

4. Horizontal strip blank or color distortion at panel height

1. Poor contact or broken flat cable/DVI cable (Submarine series)
2. Abnormal output of front panel or input of rear panel at joints

1. Reinsert or replace flat cables
2. Locate faulty display module for maintenance and replacement

5. Individual modules fail to light up

1. Power supply protection activation or damage
2. Loose AC power cable connection

1. Test and confirm stable power output
2. Reconnect AC power cables securely

6. Entire cabinet no display

1. Disconnected power supply cable
2. Network signal transmission failure
3. Damaged receiving card
4. Misinserted HUB board

1. Check power cable connection
2. Confirm and replace defective network cable
3. Install new receiving card
4. Reinstall HUB board in correct position

7. Full screen pixel distortion and image jitter

1. Incorrect driver program
2. Excessively long or low-quality network cable
3. Faulty sending card

1. Reload receiving card configuration files
2. Shorten or replace network cables
3. Replace the damaged sending card

8. Identical content displayed on all screen units

9. Low brightness and blurry screen image

1. Program error of sending card
2. Incorrect function card parameters

1. Restore and save default settings of sending card
2. Adjust minimum screen monitoring brightness to qualified level

10. Screen flickering and ghosting image

1. Faulty communication cable between computer and screen
2. Poor DVI cable connection between multimedia card and sending card
3. Defective sending card

1. Reinsert or change communication cables
2. Reconnect and fasten DVI cable
3. Replace the faulty sending card