After Restarting, check whether Vibrator is Work or NOT. So you have to delete that Cache from your phone.
Most of Sound Case happen because phone’s Cache. Also you can check Mic of your phone, Camera, Touch, frequency, Colors Wipe cache on LG K8 2016 After tap it, you can hear that your phone is ringing . after dialing #0# you are on white tester Screen. Go to Keypad and Dial #0# to check whether your Sound is OK or NOT. 2.Turn On the phone by pressing power 3.When the LG logo displays, press Volume down key until the Lock Screen. Dedicated Guide for SafeModeġ.Turn Off the phone by pressing power. IF your phone is Ringing in SAFE MODE, then Go to Normal mode and uninstall one by one and uninstall permanently cause app. So you can Identity whether that Sound error come from the App. If you enabled SAFE MODE, then your apps are disabled. Read – What is Stock & Custom Rom? Firmware? Bootloader?you can check your Sound through the SAFE MODE. So, perhaps this method also may fix your sound issue. But remember, this changes only the headphone related settings. This will change the temporary setting in the LG K8 2016. Restart your phone with Headphone connected.