Reason 1: The distance sensor of the mobile phone is blocked.

Most smartphones are equipped with a distance sensor next to the receiver. When you make a phone call, your face is close, and the screen of your mobile phone will go out automatically. When your mobile phone is far away from your face, the screen of your mobile phone will light up again. This design can increase the battery life of the mobile phone. So the black screen of the mobile phone may be blocked by the distance sensor. Check whether there are foreign objects in the earphone accessories above the front of the mobile phone. If you clean it up, the general problems can be solved.

Reason 2: The distance sensor is faulty.

When the distance sensor fails, it is impossible to correctly judge whether there is an object approaching, which may lead to misjudgment that there is no object approaching when making a call and then turn off the screen of the mobile phone. Therefore, it is recommended to send the mobile phone to the official designated maintenance center for maintenance.

Reason 3: The distance sensing software of mobile phone is not set properly.

Incorrect setting of the distance sensor may also lead to the black screen of the mobile phone. It is recommended to enter Settings-Display-Sensor for verification and re-inspection.

Reason 4: The sensor failed due to lack of leather pad.

This situation is generally a mobile phone after disassembly or screen change. In fact, the touch screen is replaced or the mat at the bottom of the sensor is lost. The solution is: there are two small holes on the original touch screen, and there is a small cushion under the holes, which is about 3 mm thick. The size and distance of the two holes are just the same as those on the touch screen, so just make one and paste it. I often cut it out and stick it on the packaging material of the battery.

PS: Can't hang up: Enter the settings, select the power button, and press it to hang up.

That's why Bian Xiao got a black screen when he called you. I hope Bian Xiao's inventory can bring you some help. When you encounter the problem that the screen of your mobile phone is black as soon as you make a call, don't directly deny the use function of your mobile phone, thinking that it is broken and needs to be replaced with a new one. Find out the best reason for your mobile phone problem from the reasons introduced by Bian Xiao, and then solve it according to the solution, so that your mobile phone will not be black when you make a phone call.