First of all, you need to know why your mobile phone is not turned on.

There are two problems when the mobile phone is not turned on: hardware or software and system. If there is an external force, such as being thrown, crushed, flooded, overheated, etc., it must be a hardware problem. If you download some software and delete some system files, you can't boot after brushing, which is generally a software or system problem. Knowing the source of the problem will solve it. There are two situations when the mobile phone is not turned on, and the solutions are as follows.

The mobile phone has a response when it is turned on, but it cannot be turned on normally;

This is the most common situation that the mobile phone cannot be turned on. There is vibration and sound when the mobile phone is turned on, but the screen is dark; After the phone is turned on, it has been stuck in the logo interface and cannot enter the operation interface; There are also mobile phones that can enter the normal interface but don't respond to anything. This is the most common manifestation of abnormal startup.

First of all: check the battery of the mobile phone. There is a reaction when the mobile phone is turned on, which proves that the battery is still working. In addition to the aging of the battery, the battery problem can be eliminated. If the battery is aging, you can try the same type of battery. If it can be turned on normally, then change a battery; If it is water, turning it on before the water is dry will lead to a short circuit of the battery, and the mobile phone will only be turned on for a while. The battery was damaged because of short circuit. You can wait for a day or two before trying to change a battery.

Then: check the phone screen. When the screen is damaged by external force, especially when some mobile phones are welded, it is particularly prone to "false non-startup" caused by the screen. Although it was only a slight fall, the screen of the mobile phone was unresponsive due to the disconnection of the line. At this time, you can pat your mobile phone and take more photos. If the screen of the mobile phone flashes from time to time, it proves that the mobile phone is just a problem of a certain line. You can find the broken solder joint after disassembling it yourself, or go to the maintenance point for maintenance. Especially when the mobile phone is turned on, the vibration and sound are normal and the screen is unresponsive. This situation should be given special consideration.

Furthermore: check whether you can enter the recovery, and consider brushing the machine. Both of the above are hardware problems, but the mobile phone can't be turned on completely because there are also many software or system problems. If the phone is stuck on the logo screen or cannot be operated when it is turned on, then it is necessary to check whether the phone can enter recovery, and press and hold the power button+volume reduction button. If the mobile phone enters the following screen, you can move the cursor through the volume+and-keys of the mobile phone, then the mobile phone can be solved by brushing the machine.