Firstly, we can inspect the components on the circuit board for any damage, such as resistors, capacitors, transistors, etc. Damage to these components may cause the circuit board to malfunction, which in turn can affect the display panel. If any damaged components are found, they can be attempted to be replaced.

Next, we can inspect the connection between the panel and the circuit board for any issues. Occasionally, the connection between the panel and the circuit board may become loose or disconnected, preventing the panel from functioning properly. If this is observed, attempt to reconnect or replace the connection wire.

Additionally, if the panel display remains abnormal, it may be an issue with the panel itself. In such cases, we can consider replacing the panel. When replacing the panel, ensure the new panel's model and specifications match the original, and follow the correct steps for installation and adjustment.