LED indicator colors

The device is equipped with Red+Blue+Green (RGB) light-emitting diodes (LEDs) to display various colors and patterns. Each color or pattern represents a specific system status or message notification.

The device state of charge is represented by a red notification LED. Battery status is displayed on the lock screen once the operating system has fully loaded. When the screen is unlocked, the battery status is shown in the status line at the top of the screen.

Color	Pattern	Description	Problem	Solution
Red	Solid on	Normal operation. The device is charging.
Red	Flashing 0.5s on 0.5s off	Charging is paused.	Charge controller bq25890-charger-0 temp > 40.0 C [1]	Operate the device in a cooler environment. Improve air circulation around the device. Turn off the device and allow it to cool off.
			Battery not fully inserted	Verify that the battery is correctly inserted.
			Battery missing	Insert a battery. Ignore this warning.
Red	Flashing aperiodically	Input power source error.	Unstable mains power source	Remove and reconnect the AC adapter into the mains power outlet. Connect the AC adapter into a more reliable power source. Replace the AC adapter.
			Unstable USB cable connection	Remove and reinsert USB cable into device. Remove and reinsert USB cable from AC adapter.
			Faulty USB cable	Replace the USB charging cable.
Blue	Fade in/out	Normal operation. Active notification message in notification tray.
Green	Solid on	Normal operation. U-Boot bootloader is operational.
Green	Flashing	Boot-loop detected in the bootloader.	Insufficent battery voltage to boot the system	Connect the device to a USB power source. Allow the device to charge for 30 minutes, then power on the device. Follow the procedure in this footnote [2].
Yellow (red+green)	Solid on	Kernel initiated in the bootloader but insufficient power to continue.	Insufficient battery voltage and/or USB charging current	Connect the device to a USB power source. Allow the device to charge for 30 minutes, then power on the device. Set the WWAN (cellular modem) and WLAN (wi-fi and Bluetooth) hardware kill switches to the disabled position. Follow the recharging procedure.

[1]

To check battery temperature, launch the Usage application then tap or click on the Thermal tab. Look for the bq25890-charger temperature sensor.

[2]

Follow the steps below to work around the problem:

1. Ensure that the USB charging cable is powered and fully inserted into the device.

2. Enable trickle-charging by holding down the Volume Up button for 5 seconds.

3. Once the light stops flashing, remove then insert the power cable while still holding the Volume Up button.

4. Release the Volume Up button and allow the battery to charge for at least an hour.

5. Unplug the USB cable from the phone.

6. Hold down the Power button for 18 seconds.

7. The device should power on and the indicator LED should illuminate green.

8. Plug in the USB charging cable.

If the above steps do not help, follow the recharging procedure.

See also

Resolving charging issues