The cause of the mute key failure is resolved as follows
1, the system has a problem resulting in the mute key failure, contact the after-sales consultation to the store to deal with it
2, in addition, the phone's mute key failure, internal circuit open or motherboard chip failure may lead to the mute key failure, this situation needs to contact Apple's official after-sales maintenance to solve.
3, contact the after-sales center for free testing and maintenance
This is the silent bar cable is broken, need to replace, it is integrated with the power volume