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 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