ScreenThe screen is too dark.• The [Adaptive brightness] setting reduced the brightness according to the ambient brightness.Manually adjust the screen brightness.1. Swipe up the home screen, and then in the app list, tap [Settings] ® [Display] (® [Adaptivebrightness])*1.*1 Android 9 only2. Tap the [Adaptive brightness] switch to turn it off.3. Android 8.1Tap [Brightness level] and then adjust the slider.Android 9Tap , and then tap [Brightness level] and adjust the slider.• The [Minimum limit brightness] setting of customized silent mode was turned on. Turn the settingoff.1. Swipe up the home screen, and then in the app list, tap [Settings] ® [Sound] (®[Advanced])*1 ® [Customized silent mode].*1 Android 9 only2. Tap the [Customized silent mode] switch to turn it off, then tap the [Minimum limitbrightness] switch to turn it off.3. Tap the [Customized silent mode] switch to turn it on.There are red, green, or blue dots on the screen, or there is unevenness in screen colors orbrightness.• The following are not malfunctions.– Although advanced high-precision technologies are used in the production of color LCD screens,a very small number of the screen pixels may be dark or remain constantly lit.– Due to the natural characteristics of LCD screens, you may notice unevenness in colors andbrightness depending on your angle of view. Hues may also vary by product.Residual images are displayed.• Residual images may be displayed if the same screen is displayed for a long time. Display a differentscreen.I cannot operate the touchscreen.The touchscreen operates involuntarily.• Temporarily put the unit into sleep mode and then wake it up again.IndicatorThe indicator flashes in orange.• The battery cannot be charged temporarily because the ambient temperature is too low or too high.Leave the unit in an environment of 10 °C to 35 °C (50 °F to 95 °F) for about an hour.The indicator lights in red.• The remaining battery level is approximately less than 15 % of a full charge. Charge the battery.The indicator flashes in red.• Battery authentication failed. Use only a specified battery.• There may be debris lodged in the battery charge terminals. Remove the battery and remove anydebris found.• Charging may have stopped automatically. Disconnect the AC adaptor and then reconnect it.The indicator does not light during charging.Battery charging ends quickly, or the battery cannot be charged at all.• The AC adaptor or USB connection cable is not connected properly. Confirm all connections.60 Operating Instructions - Reference ManualTroubleshooting