For help, the phone will flash black line and finally black screen.

There are many reasons why mobile phones can cause this situation. It is recommended to restore the factory settings or upgrade the mobile phone to see if it is still black. If there is still a problem, be sure to consider whether it is a hardware problem! If it is hardware, it can only be repaired after sale because of the black screen of a specific Android version of the phone. 1. It is common for many mobile phones to have a black screen after long use. The main reason is that the effective service time of mobile phone battery is 1 year, or there is a problem one year after three years. Excessive use leads to aging of mobile phone battery and insufficient voltage. 2. The problem of black screen conflict in mobile phone crash: There are a lot of application software for smart phones now, but some of them are inherently conflicting, which will also lead to black screen. Therefore, after installing a lot of software, the black screen is basically the reason of G.3. Black screen of mobile phone or five-brush problem of upgrading system: Many people are keen to upgrade their systems with better systems. In fact, some system phones are not very supportive, and some are incomplete, which will inevitably lead to a black screen when used in the future.