Caused by third-party software. In use, the black screen is mostly caused by downloaded third-party software, which is rare in the software that comes with this machine. There may be two reasons: there may be problems with the software itself, such as instability of the software itself or mismatch with the mobile phone system, which can be solved by uninstalling the software; If the software is incompatible, it needs to be installed and uninstalled one by one, and the experiment will check which software is the problem. If you find it, uninstall it, and the problem can be basically solved.