Q : Although the SM10 is connected with either USB cable directly or cradled with AC power, the charging LED lamp and UI is not displayed.
A : If the battery’s exhausted(no charge in sleepmode for 2 or 3 days), please connect either usb cable or cradled with AC power and wait a minute then charing LED and UI will be shown up.
This is not a device defect but all qualcomm based devices’ common behaviour.