One aspect of the disclosure directs to a signage device, which include a display device, a camera, and a signage controller. The display device is configured to display media content in a display mode and display diagnostic information in a diagnostic mode. The diagnostic information includes content operational and deployment information related to the media content being displayed, and system information of the signage device. The signage controller is configured to control the camera to capture an image frame, process the captured image frame to generate information for a server system such that the server system provides the media content to the signage controller based on the generated information, display the media content on the display device in the display mode, switch the display device to the diagnostic mode in response to a diagnostic input command, and display the diagnostic information on the display device in the diagnostic mode.