What is the reason for the old black screen of the iPhone8 phone recently?

The cause of the black screen is a motherboard issue

iphone8 black screen may be the motherboard is broken, mine is a white screen, the standby is turned on on the white screen, go to repair the motherboard is broken, it took 150 to repair.

It is very likely that the wiring between the motherboard and the screen is broken, or your screen is broken.

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.

Is it a forced shutdown or stuck if there is no power If it is stuck and the screen is black, force it to shut down Forced shutdown Click Volume Volume - Long press the lock screen key.

2. iPhone8 battery aging, or water damage, bulging, etc., will also cause iPhone8 can not turn on, how to determine that the battery is damaged, connect the phone to the charger, if there is a charging sign display, but the battery is damaged.

2. Forced restart.

3. Confirm whether there is a hardware problem.

1. Test it with an external power supply. After plugging in the charging device, if it can be turned on, it is a problem with the battery, and you can buy a battery replacement.

2. Many chips on the motherboard, including CPU, baseband, memory, board lines, and power supply IC, one of them will cause failure to boot, and the motherboard problem is a headache, so this must be sent for repair.

Fourth, the iPhone is used for too long and is overloaded.

Press the home button and the power button at the same time for about 10 seconds to force the power off, rest for a while and then try to turn it on.

Every day with you to share a variety of mobile phone repair cases, mobile phone is a necessary tool for everyone, maybe today you don't need me, maybe tomorrow I can just be able to solve problems for you on the mobile phone, attention, like, **, Brother Mao will take you to learn more about mobile phone common sense.

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

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.First of all, see if it is the reason why the battery is running out, if this is the case, connect the phone to the power supply to charge. It should be noted that even after plugging in the power source and charging, it will take a few minutes to turn on the device.

2.Try to restart, iphone 8 8plus reboot method is different from the previous iphone phone, the correct way to reboot is.

3.If it can be restarted, this is the best; If it can't restart, try to enter recovery mode to restore iPhone8 system:, specifically.

4.If it still can't be solved, try to enter DFU mode to flash the device, the steps are: 1. Press and hold the power button to turn off the device; 2...