LS423 Theory of Operation
- BrightSign TechDocs
This section describes how specific components operate on the LS423.
On-Board LEDs
The LS423 has a single red LED to indicate that the power is on. The LED will flash during the firmware update process. It will also flash a certain number of times to indicate an error state. The flash codes are described below:
Flash code | Description |
2 | Unspecified error |
3 | Network recovery script is preparing to run on a device configured for network recovery. |
4 | No upgrade file found. |
5 | Failed to load kernel module. |
6 | Board is not capable of running the current firmware version. |
7 | A piece of on-board hardware is not working correctly. |
8 | Problem related to the storage device (either the USB drive or microSD card) |
9 | Problem related to the registry/NAND |
10 | The autorun script encountered a load/run error. |
11 | WiFi-related error |
12 | Unable to find a bootable image. |
13 | The root file system has failed verification, which is used to detect whether the file system has been tampered with. You can recover a player that is showing this error code by performing a firmware update with secure boot. |
14 | Boot loader failure |
On-Board Switch
The on-board switch is connected to a GPIO12 pin that is pulled low when the service (SVC) button is pressed. Conversely, a pull-up on the button normally sets the GPIO12 pin to be pulled high.
Reset Switch/GPIO Button
The on-board switch is connected to the reset circuit. Pressing down the reset button will send an initial signal to the system software, and holding the reset button low for approximately 4 seconds will cause a hard reset.
microSD Slot
The LS423 has one microSD slot, which supports transfer modes up to UHS-1 DDR50 (50MB/s). There is no inherent limit on the storage capacity of microSD cards used with the player.
Wireless Module
The LS423 has an internal M.2 slot for installing a compatible wireless module. The M.2 wireless module connects via cable to an external, attachable wireless antenna.