What should I do if the phone is blacked out after unlocking, what should I do if the phone is black

The black screen after the phone is unlocked, it is usually caused by a conflict between the third-party software and the system software, or the system file is deleted, or the ROM package itself is caused by a bug.

The solution to the black screen after the phone is unlocked:

1. The phone is only rooted.

After the phone is rooted, the system software is deleted by mistake. In this case, you need to use the one-click root clearing function in 360 Mobile Guard to unroot the phone. Then a factory reset is OK.

2. The mobile phone is flashed into a third-party ROM package.

The black screen phenomenon after the lock screen caused by flashing the third-party ROM package into the mobile phone may be caused by the instability of the ROM. It's best to change to another brush bag, the official is the most secure.

3. Third-party software.

The phone is not rooted and has not been flashed, this situation is generally caused by the incompatibility or conflict between the third-party software and the system software, as long as you find this software and uninstall it.

A black screen appears after the phone is unlocked, it is recommended to:

1.Press and hold the power button for 8-10 seconds to restart the machine (some machines need to press and hold the power button and the lower volume button at the same time for more than 7 seconds).

2.If the screen is still black after powering on, please follow step 1 to restart the machine, press and hold the menu button or press and hold the lower volume button when the Samsung logo is displayed on the phone, until the word "safe mode" is displayed at the bottom left of the phone screen, and then release. Then enter the safe mode to uninstall the self-installed app attempt.

If the problem persists, it is recommended that you bring the purchase invoice, three-guarantee voucher and mobile phone to the local Samsung service center for inspection by the engineer.

In this case, you can flash or upgrade to a version of Android

If you are using a vivo phone, how to troubleshoot the black screen:

1. Force restart your phone.

Try force restarting your phone to see if it resumes, and check if the power and volume buttons are stuck in the case.

Force restart method: Long press"Power button"More than 12 seconds.

2. Upgrade the system version.

Click Settings - System Upgrade interface to upgrade the phone to the latest version to view.

3. Reset all settings.

Go to Settings - System Administration - Backup & Reset - Restore all settings and follow the on-screen prompts.

Note: Restoring all settings will not delete any data or ** files, only all settings of the phone will be restored, and some third-party application accounts need to be re-logged in to confirm that it does not affect the use of the software before operating.

4. Service center testing.

If the above methods cannot be solved, it is recommended to back up the mobile phone data in advance, bring the mobile phone and purchase voucher to the vivo customer service center for testing, and enter the mobile phone vivo official website APP--Service--My Service--Service outlets to query the address of the nearest customer service center outlets and**.

Hello, the phone goes black as soon as it is unlockedReason:1The black screen of the mobile phone is one of the faults that are often encountered in the repair of the mobile phone, and the black screen can be divided into two types:

One is a black screen in use, and the other is a black screen in standby. Here are some basic causes and solutions that cause black screens. 2.

Most of the black screens in use are caused by their own third-party software, and this situation rarely occurs with the machine. 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. 3.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 does not detect the key trigger signal for a long time, that is, standby, when you need to use the mobile phone, a button will activate the power-saving circuit, and then the screen will light up. 4.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.

The phone suddenly has a black screen, and then the screen is locked, which means that the phone has crashed. In this case, the usual method is a mandatory shutdown. Through the power switch of Chang'an mobile phone, turn off and then turn it back on.

1.This is your phone's automatic battery saving setting. Open the phone settings selection screen, or lock screen, then turn on the screen for an hour or more.

Whether the standby time is too long, you can choose to adjust the standby time in the mobile phone settings. 3.Replace the software to see **, see if it is caused by the software, if so, upgrade the software to the latest version to solve.

The voltage is unstable, and the keys may have been hit. led by UMC. It is advisable to go for a repair.

As soon as the phone is unlocked, the black screen will be solved, and the boot line is abnormal: use an external power supply to supply power to the mobile phone, use the power meter to detect whether the indication has changed, if there is no change, it is likely that the boot line is broken or the boot button is not in good contact. 2. The power supply circuit of the battery is abnormal

Use the external interface to power the phone, see if it returns to normal when it is turned on, if it is normal, it is determined that the power supply circuit of the mobile phone is abnormal. 3. The IC of the mobile phone power supply is abnormal: test the test point of the peripheral circuit of the power supply IC according to the circuit schematic diagram to see whether the test value is normal.

4. The system clock and reset of the mobile phone are abnormal: you can use the dual total oscilloscope to detect the CPU power supply of the mobile phone to check whether the waveform in the reset is correct. 5. There is a problem with the logic circuit

That is, the fault of the mobile phone circuit version can generally be solved by repair welding. 6. Software conflict: The installed software does not match the system of the mobile phone, which may also cause the mobile phone to fail to boot, you can connect the mobile phone to the computer to delete the program.