How to solve the problem that iPhone8plus suddenly turns on black screen?

1. The boot line is abnormal: use an external power supply to supply power to the mobile phone, use the electric 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 supply power to the mobile 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. Problems with logic circuits: that is, faults in the circuit version of mobile phones, which 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.

Extend. iPhone OS is an operating system developed by Apple for the iPhone. It is mainly for iPhone and iPod touch.

Just like the Mac OS X operating system on which it is based, it is also based on Darwin. The system architecture of iPhone OS is divided into four layers: the core OS layer, the core services layer, the media layer, and the cocoa touch layer.

System operations take up about 512MB of storage space. iOS's scalability is particularly strong,With iPhone, you can log in to the App Store with one click (**App Store),Easily** to the applications you need,Use iPhone without worrying about viruses,From software to games,There is everything,Copycat machine imitates the interface again,The real ability - scalability can never be imitated。 The powerful security of iOS is completely different from other smart operating systems for mobile phones.

Several situations and solutions for the black screen of the Apple mobile phone and the solutions:

Apple after-sales: 0755-23947183

One situation where the iPhone itself is unstable, resulting in a black screen. This kind of black screen can be attributed to an unstable automatic shutdown, which is because the machine is of poor quality, resulting in shutdown for no reason. Because there is no big problem with the hardware, you can just press and hold the power button and wait for it to turn on.

The second scenario. DFU mode is the mode in which the Apple system cannot be turned on if there is a problem, while entering the recovery mode can be recovered with iTunes. But the phone is fine, and it can't be turned on because it can't be turned on because it has entered DFU mode by mistake, but it's actually very easy to solve.

You only need to press and hold the power button and the home button at the same time and wait for the iPhone to react, generally for more than 10 seconds, if there is no response for tens of seconds, the following steps continue.

In the third case, you need to enter DFU mode, first of all, iTunes must be installed on the computer, and you can ** a new iOS system. Or restore files with a backup beforehand. Of course, during the recovery process, the computer can be connected to the Internet, and it can also be ****, but the wait is longer.

1. The first method: First of all, you can try to press and hold the power button and the volume plus or minus + - three buttons at the same time, and then the phone will vibrate.

2. Then the phone will be as follows (such as: Figure), and then slide the shutdown button to restart.

3. The second method: press the volume to add first.

4. Then quickly press the volume reduction button to respect the elderly.

5. Then press and hold the power button on the right side of the phone for about 10 seconds, then the phone will be forced to shut down and start again, and the screen will display the Apple logo, indicating that the phone has been restarted.

Press and hold the Power and Home buttons at the same time to restart.

2.If the battery is very low, charge it first before turning it on.

3.Find a mobile phone repair agency for repair.

Hope it helps.

First, the iPhone itself is a refurbished machine or other machine with quality problems, and occasionally there will be an unstable black screen, but it is not a damaged screen.

The second, which entered Apple's DFU mode by chance, is Apple's recovery mode.

The third possibility is that the Apple system won't boot.

The fourth is that the hardware is damaged and the screen is broken.

The main reasons why the phone can't turn on are:

To determine whether the phone battery is charged, you can plug it in and try to turn it on.

Hardware problems, this can only be sent for repair, if in the warranty must be sent to the designated after-sales service.

Please bring the equipment to the regular after-sales center for professional technical testing to avoid blind maintenance, resulting in damage to other parts.

It is recommended to bring the equipment to the regular after-sales center for professional technical testing to avoid blind maintenance and damage to other parts. Chunxi Road Silverstone Office Building for mobile phone on-site repair service - or click on the avatar for consultation.