① If some areas are abnormal, check if the cables of the corresponding module or display module are damaged, if the interfaces are secure, and if the installation sequence is correct. ② If the entire screen display is abnormal, check if the cables related to the display controller are damaged, if the interfaces are secure, and if the installation sequence is correct or if the power is turned off and restarted. ③ Please replace the control computer and display controller for retesting.

1. The on-off sequence of outdoor LED display screens should be followed according to instructions 2. Outdoor LED display screens are exposed to the outside for extended periods of time and need to cleaned in a timely manner to prevent dust from covering the surface and affecting the visual presentation. 3. Outdoor LED display screen power should remain on 24/7 with a black screen for resting mode . . 4. Outdoor LED display screens should rest for more than 3-5 hours per day to maintain their normal operation. 5. The power supply must be stable and grounding protection is essential, especially in environments with strong lightning and adverse weather conditions. It is recommended that the display remains idle during weather events. 6. The main control computer and other related equipment should be placed in a room with air conditioning and minimal dust to ensure ventilation, heat dissipation, and stable operation. 7. If you have any other questions, please contact our Retop outdoor LED panel factory or sales representative.

After the control card is powered on, please observe if the power indicator light is on. A red light will indicate that the 5V voltage has been connected. If it does not light up, immediately turn off the 5V power supply. Check whether the 5V voltage is properly connected, whether there is overvoltage, reverse connection, failure, output short circuit, etc. Please use a separate 5V power supply to power the control card. If the red light is not on, it needs to be repaired.

1. Check if the power supply is powered on. 2. Check if the communication line is connected and if there are any errors. (Stepping screen) 3. The synchronization screen detects whether the communication green light between the sending and receiving cards is flashing. 4. Is the computer monitor protected, or is the display area black or pure blue. (Stepping screen)

You can find it by removing the battery, please refer to the technical specification of NB007.