Huawei Mate7 suddenly black screen, what to do

You can force restart your phone by pressing the power on button + volume up button for ten seconds at the same time, and if it doesn't work, try the force recovery method. First to EMUI**.

Prepare an SD card with a capacity of 2G or more to ensure that the free space is larger than the size of the upgrade package, and it is recommended to use brands such as Sandisk, Kingstone, or KingMax. 2.

Plug in the charger, press and hold the volume up and down buttons, and press and hold the power button for more than 10 seconds to start the phone. The phone will enter the SD card to force the upgrade, if it will not be able to start because the battery is exhausted or the battery is low, charge it before upgrading to ensure that the phone can start, please insert the charger during the upgrade process, otherwise the upgrade will fail if the battery is insufficient. 4.

After the phone enters the upgrade, the upgrade will be completed automatically, and the upgrade time is about 5 minutes, if the upgrade fails, you can try to try again. If it doesn't work, bring the warranty card to the nearby Huawei after-sales service center outlet for maintenance, and back up the data in advance before going!

The black screen of the mobile phone is one of the faults that are often encountered in the maintenance of mobile phones, and the black screen can be divided into two types: one is the black screen in use, and the other is the black screen in standby.

Here are some basic causes and solutions that cause black screens.

It can also be subdivided into two kinds: one is that there is a problem with the software itself, the software itself is unstable, or it does not match the mobile phone system, etc., this is easy to solve, just uninstall it;

The second is the conflict between the software and the software, which is a little more troublesome to solve, and requires a software to install and uninstall the software in the experiment. If you find it, uninstall it, and the problem will basically be solved.

As for the black screen in standby, let's talk about the standby principle first, because most of the straight board machines have a power-saving circuit design: the mobile phone will automatically turn off the screen if it can't detect the key trigger signal for a long time, that is, standby, when the user needs to use the mobile phone, a button will activate the power-saving circuit, and then the screen lights up!

The reason for the black screen is often reflected by the delay of the screen triggering circuit. That is to say, the mobile phone system has issued a command to light up the screen, but because the circuit is delayed, it is not sent successfully, and the screen is not lit successfully, but the mobile phone system thinks it has been lit, so it causes a black screen.

You can give it a try. The phone screen is black, don't be in a hurry to restore it first. Use a friend's mobile phone to call your own **, if you can get through, you can also answer normally. That's basically the problem.

There is no need to panic when a black screen appears, and there is no need to pick the battery immediately. You can leave the phone for about 3 minutes without pressing any keys on the phone, and then press the button again to activate the screen.

1. The phone responds but the black screen indicates that there is a conflict between the system software, which causes the system to crash. Or the screen display of the mobile phone is not normal, and it is also possible that the chipboard of the mobile phone is damaged.

2. The black screen of the mobile phone is generally caused by the mobile phone being bumped or the screen is changed. Drops can cause damage to the screen, disconnection of the motherboard, broken chips, etc. You can press and hold the part under the earpiece with your hand, and squeeze the screen with your thumb for a short while, and the touch screen does not respond at this time, which can be judged as a problem with the touch IC.

3. The rest is that the screen motherboard has been disconnected or the line has been damaged. There is a problem with the hardware, and the phone needs to be sent to the corresponding after-sales office for repair and replacement.

4. Part of the reason is the system conflict caused by third-party software**. This can be fixed by rebooting or resetting the factory settings. Mobile phone users can restart the phone to see if the phone is in a black screen state.

If the phone is still in a black screen state, android users can put the phone into recovery mode.

5. In the power-on state, press and hold the volume up and power buttons to enter recovery mode. If the phone screen is still black in Recovery mode, then it must be a hardware problem. Users can select WipeDate and WipeCache in Recovery mode, and after confirmation, select RebootSystemNow to reboot the phone and restore it to factory settings.

If the phone suddenly has a black and white screen and the color display is abnormal, you can troubleshoot it by the following methods:

1.Check if the sleep time for healthy use of the phone is turned on Downtime function: Settings > Healthy use of the phone > Sleep time Downtime, when this setting is turned on, when the phone reaches the set sleep time, the screen will turn black and white.

2.Check if the eBook mode is turned on:

3.Check if the color correction switch is turned on:

4.Check if the color inversion feature is turned on:

5.Check to see if Dark Mode or Dark Power Saver** is turned on.

Go to Settings > Battery > Dark Power Saver**If the switch is on, turn off the switch. (If it is not found, the mobile phone does not support this function, check other scenarios).

6.Go to Developer Options and check if the Mock Color Space switch is turned on, you can do the following:

7.If none of the above troubleshooting resolves, you can try restoring all settings. If the problem persists after all settings are restored, we recommend that you back up important data in advance (QQ and WeChat need to be backed up separately) and bring your purchase voucher to the Huawei Customer Service Center for testing.

If your Huawei phone is dead, it is recommended to try the following:

1. Press and hold the power button to open the options menu, and click "Restart". If it doesn't pop up, press and hold the power button until your phone vibrates to force restart.

3. If the crash still occurs after restarting, it is recommended to restore the mobile phone to the rental stool factory settings after backing up important data.

4. If you can't operate your phone after it crashes, please upgrade your phone to force it. After upgrading, the data in your phone's internal storage will be erased.

<> can also have an after-sales outlet address inquiry entrance at the bottom of the official website page of Huawei**;