What to do if Apple iPhone7 iPhone 7 Plus suddenly black screen

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.

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.

Black screen in standby,Let's talk about the standby principle first,Straight board machine because most of them 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 you need to use the phone, a button will activate the power-saving circuit,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.

iphone7plus black screen first to troubleshoot software problems, if the software is not faulty, you can only detect the hardware.

You can restart it directly to troubleshoot the software, but if the phone gets into the water, don't try to restart it, and go directly to the maintenance.

1. Press and hold the power off button + volume down button at the same time (the power off button + home button is only useful before the 7th generation, and the volume button must be pressed for the 7th generation) for 15 seconds until the Apple icon reappears.

2. If the Apple icon does not appear, you can only judge the hardware problem.

Generally, if it is a heavy fall or water ingress, it will cause the phone to automatically restart, black screen, WIF or no network signal, call and ** and other malfunction problems. What's more serious is that it crashes directly and does not have any boot response. This class is a hardware issue.

The above situations are generally faults such as disconnection of the motherboard layer, virtual soldering of the CPU, short circuit of the display IC, power supply IC and power supply IC, baseband circuit, and bad sectors of the hard disk. These can actually be repaired, and if one of them is broken, it will only be about 300 repairs.

Have been repairing at Apple repair centers and have encountered a lot of this situation.

However, repairing these requires engineers with relatively high motherboard chip technology. The general small shop technology is not in place, and it is easy to fix some small problems into big problems. As a result, there are too many bad motherboards to repair in the end. So it's important to choose a technical and honest repair point.

The following is the iphone7 motherboard repair chip diagram for reference.

Reasons for Apple 7plus black screen.

There are only two reasons.

One is the system collapse, the solution.

At the same time, press and hold the power off button + volume button for 10 seconds to force restart.

2. If you still can't enter the system through force restart.

That is, the machine is no longer a problem of the system, but a problem of the motherboard.

You need to inspect the motherboard to know which chips are broken.

The motherboard is actually composed of dozens of chips such as CPUs, hard disks, and power amplifiers, and only need to replace the faulty chips to recover.

Instead of taking it for granted that the motherboard is broken and replaced with a motherboard.

As shown in the figure below, an experienced master will replace the burned power IC. Generally, you can re-enter the system.

The small yellow square is the power IC.

Changing the chip is a fraction of the cost of changing the motherboard, and there is no need to change the motherboard at every turn to do mobile phone motherboard chip maintenance, and I know these very well.

The reason why the smartphone has a black screen.

1. Mobile phone crash memory problem: Under normal circumstances, when the mobile phone stores too many things, many friends can feel that the mobile phone is running too slowly, and when their mobile phone is occupied by 80% of the memory that can be driven, it may crash.

2. The problem of the second contact of the mobile phone crash: This is the loosening of the contact of the mobile phone screen, which is not a big problem, but it can directly lead to the black screen of the mobile phone, which is difficult to find and can only be found after a lot of tests, which is generally caused by the mobile phone being bumped.

3. Mobile phone crash three battery problems: It is common for many mobile phones to have a black screen after using it for a long time, the main reason is that the effective use time of the mobile phone battery is 1 year, or it is three years but there is a problem in one year, and excessive use leads to the aging of the mobile phone's battery and insufficient voltage.

4. The problem of four conflicts in mobile phone crash: There are many applications for smartphones nowadays, but there are some software that are born with conflicts, which can also lead to a black screen, so the black screen after installing a lot of software is basically this reason.

5. The problem of mobile phone crash and five flashing: Many people are keen to brush the phone and use a better system, in fact, some system mobile phones are not very supportive, and there is also a complete flash, which leads to the inevitable black screen when using it in the future.