Only headphones can be heard.
1: open the settings, look at the application, see if the notification is all open.2: double-click the home button (that is, the middle circle) see the background program, push right. You'll see a volume control and see if it's on.3: turn on "Settings" - "general purpose" - side switches for:1: lock screen rotation. 2: mute. Look what you choose.4: shutdown, restart the device.5: open "Settings" - "general" - "restore" - "restore all settings", restore all settings, you can rest assured that it will not erase any data on your device. Just restore to the factory settings. Then you can reset it again.6: the gesture problem causes if you open the gesture task, turn off first, and then move on to the settings universal side switch for re selecting the lock screen. Then turn on the gesture task.If you have escaped from prison, you can try this method.The iPad file in the System/Library/PrivateFrameworks/IAP.framework/Support/ directory is restarted.If the above methods are useless, then it is recommended to re backup from the new brush, and the same problem, then send it after sale.
If you make the system problems, it is recommended to restore the system, and if it is water, and so on, it is recommended to go to the apple after-sales service point, professional inspection.
Check the audio port. If it's water, please try to fix it or restart it
