What to do if iPhone6 black screen doesn t respond

Force shutdown to see if it's a motherboard issue.

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.

Connect your computer and open iTunes to see what prompts, usually restore or upgrade! Just follow the prompts!

The phone shows a black screen for many reasons, system issues, software conflicts. If the screen is damaged, it will be illuminated into a black screen, and Samsung mobile phones generally recommend the following steps to troubleshoot and deal with it:

1. Press and hold the power button and the down volume button at the same time for more than 7 seconds, and try to turn the device on and off again.

2. Connect the charger to see if there is a charging display, if there is a charging prompt, you can charge it for a while and then turn it back on.

3. If you can operate the phone after restarting or charging, uninstall the third-party plug-in program that was operated before the black screen.

4. Back up your phone data (**book, short message, multi** file, etc.), and restore factory settings.

If the problem persists, please bring the purchase invoice, repair card and machine to the service center, and the engineer will check the machine and deal with it.

In general, it may be due to the battery running out, resulting in a black screen that cannot be turned on. If this is the case that we can't turn on, please connect the phone to the power first, if you see a charging sign on the screen at this time, and the battery is very low, it means that the battery is dead.

Some friends think that when they are connected to the power supply and charging, they can turn on normally. In fact, if you use up all the battery power, the charge needs to be charged to 5% before it can be turned on normally. So in this case, please let the phone charge for a while before turning it on.

If you are sure that the current battery of your phone is sufficient, but it cannot be turned on normally, there may be a problem with the software system of your phone. At this time, we can try to press the "Home and Power" button of the mobile phone at the same time until the screen is lit up and there is a display.

If the above operation method does not work, at this time we can also connect the phone to the power supply, and then press the power and home button on the home screen at the same time to see if it can be turned back on.

iPhone reboot tips:

1. Press the home button and hold it for 6-8 seconds to exit any program that can get your iPhone stuck.

2. Try to press and hold the power and off button, if it can be restarted, this is the best.

3. If that doesn't work, try pressing the home and hibernate wake-up buttons at the same time, and hold it for about 10 seconds to force it to shut down!

4. If the above methods don't work, you can try to connect to the PC and use the [Restart] function in PP Assistant, iTools and other tools.

iphone6 black screen does not turn on to several situations.

One is that the tail plug cable is broken, or the battery is broken, and the power cannot be supplied.

Just change the tail plug.

The second is a system problem, force restart or flash the machine.

The third and fourth motherboards are faulty.

It's time to repair the motherboard.

If the motherboard is also faulty, it will have to be replaced entirely, and the replacement data is gone.

Instead, test and see if those chips are burned, and just change the chips.

There are more than 200 chips for a chip, and more than 2,000 for a motherboard.

Therefore, it is unscientific to change the motherboard when encountering motherboard problems.

I have been doing maintenance in Guangzhou, and I know this better.

The following picture is a diagram of the motherboard chip taken when the chip is usually repaired for your reference.

For friends who encounter the black screen of iPhone6, first of all, we should detect whether it is due to the battery draining, which causes the phone to shut down automatically, so that the black screen does not respond at all.

If there is no power, please connect the power charging cable of your iPhone in time, charge it, and turn it on normally. Under normal circumstances, after charging to 5%, you can press the power button to start the phone.

If it is not due to the black screen not responding due to no power, at this time we can try to press the "Home and Power" button on the iPhone at the same time, and hold it to see if the phone screen will respond.

If you're lucky, you'll see a white Apple logo on the iPhone 6 screen, indicating that your iPhone has been forced to restart.

If this method doesn't work, you can also connect your iPhone to the power supply first, and then try to press the "Home + Power" button on the home screen at the same time to see if the phone responds.

Of course, if you have tried all the above methods and confirmed that the black screen is not caused by a dead battery, it is recommended that you go to the Apple authorized after-sales service where you are located and ask them to help you detect the specific problem.

You can take the mobile phone to a bright place and lift the mobile phone, so that the gaze is less than 30 degrees from the mobile phone screen, and observe whether the mobile phone screen can vaguely see the content displayed on the mobile phone screen, if you can see it, it means that the backlight driver module on the motherboard of your mobile phone is faulty, and the display backlight boost module on the motherboard needs to be replaced. If you can't see anything, it is very likely that the display LCD is damaged and the screen assembly needs to be replaced.

If it's not because there is no power, then it's a malfunction, and the reasons for the black screen are as follows:

1. The phone is overheated: After opening too many programs, the CPU load of the phone is too high, the phone is hot, and the screen is not powered enough to cause a black screen, so it is recommended to close other programs running in the background;

4. It is normal to put it next to your ear to answer the black screen of the mobile phone when you are on a call, if it is still in a black screen state when you leave your ear, it is suspected that the sensor is damaged and needs to be repaired;

4. Wiring failure or poor contact, screen damage, etc.: If the above reasons still cannot be removed, and the mobile phone is suspected of malfunctioning, it is recommended to go to the mobile phone after-sales point for inspection and repair.

If the phone turns on but the screen doesn't show up, the screen doesn't show up.

Please lift your phone up to a bright place in a bright spot. Make the eye less than 30 degrees angle with the mobile phone screen, observe the mobile phone screen, whether you can vaguely see the content displayed on the mobile phone screen;

If you can see that the backlight driver module on your phone's motherboard is faulty, you need to replace the display backlight boost module on the motherboard;

If you can't see anything, it's most likely that the display LCD is damaged and the screen assembly may need to be replaced.