LS423 Theory of Operation

 

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.

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.