The phone is ringing for no reason, but the screen is black, there are no messages, and there are no calls.

1. A black screen on a mobile phone is one of the common faults encountered in mobile phone maintenance. Generally, black screens can be divided into two types: one is a black screen during use, and the other is a black screen in standby. Here are some basic causes and solutions for black screens. 2. Most black screens during use are caused by third-party software downloaded by yourself. This situation rarely occurs with the software that comes with the machine. It can also be subdivided into two types: one is that the software itself has problems, the software itself is unstable, or does not match the mobile phone system, etc. This is easy to solve, just uninstall it; the other is between software and software. If there is a conflict between the two, this solution is a little more troublesome. You need to install and uninstall each software. Experiment to find out which software is the problem. If you find it, uninstall it, and the problem will basically be solved. 3. The screen is black during standby. Let’s talk about the principle of standby first. Most candy bar machines have a power-saving circuit design: if the phone cannot detect the key trigger signal for a long time, it will automatically turn off the screen, which is standby. When you need to use the phone, Pressing the button will activate the power-saving circuit, and then the screen will light up. 4. The reason for the black screen is often that the screen trigger circuit is delayed. That is to say, the mobile phone system has issued a command to light up the screen, but it has not been sent successfully due to circuit delay. As a result, the screen has not been successfully lit, but the mobile phone system thought it had been lit. , so it caused a black screen.