iPhone7 mobile phone does not respond when turned on, the black screen does not display, what is the

First, the reason for the machine is that the bai machine cannot be opened.

The mobile phone can't be turned on, and there are many kinds, if there is a machine failure.

Then you don't have to make a fuss, just press and hold the "Power Button" and "Home Button" above your phone at the same time.

If you press and hold at the same time and it doesn't turn on, remember not to let go, the press and hold time is about 10 seconds, and it will generally turn on.

2. Reasons for jailbreak.

Many users have reported that after the jailbreak of the mobile phone, the mobile phone begins to turn on.

If you find that your phone can't turn on after jailbreaking, or after upgrading the system, you just need to connect to iTunes and fix it.

Or you can use other mobile assistant software to fix it.

3. Hardware failure.

The Apple phone can't be turned on, check if there is a problem with the switch button of the phone, or if there is a hardware problem in the phone.

If you have experience in hardware maintenance in this area, you can disassemble the machine for testing, but this practice is not advocated, and it is recommended to send it to the warranty.

First of all, you need to try to force restart the boot, here's how:

1. Press the "Power Button" + "Volume Down Button" at the same time.

First of all, you need to identify whether it is a hardware problem or a software problem, and confirm whether there is a hardware problem.

Test it with an external power supply to see, 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.

If it's not a battery problem, then see if there is a problem with other hardware, such as a broken screen or a black screen caused by water inside, this must be sent for repair. Confirm if there is a problem with the software.

Try to turn it back on, press and hold the power button and the home button at the same time to hard shut down the machine and then turn it on until the white apple logo appears.

If method 1 doesn't work, try plugging it in and pressing both the power button and the home button at the same time, this is to detect whether the battery is suddenly running out and causing the automatic shutdown.

If the first two methods don't work, it's time to enter your iPhone's recovery mode! Generally, you can connect your iPhone to the computer and press the home+power button at the same time for about 10 seconds to appear the recovery option, press restore OK, Apple.

iphone7

Plus or iPhone7 Restore.

Tips: iPhone put the liquid touch indicator on the SIM card, after taking the card, if you see a red or pink dot, it means that there is water, under normal conditions, it is white or silver.

First of all, it is recommended that you charge it first, see if there is a display, and then make sure that the phone has no response when it is turned on, this is a mobile phone failure, it can be a software or hardware problem, you need to go to a professional to test it.

Hello, first check to see if the phone is in a disadvantaged state. If not, it could be a problem with the motherboard. There may be a problem with the screen of the phone.

You'll need to take your phone to a professional repair service. I hope you can be satisfied! Hope! Thank you!

1. There is no electricity.

Don't say this little white, there may also be users who can't turn on because the battery is running out. When we encounter iphone7 can not 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.

In addition, don't think that when you connect it to the power supply, you can turn on it normally when it is charging. 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 trying to turn it on.

2. Software malfunction.

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 button + power button on the home screen of the mobile phone at the same time until the screen is lit up and there is a display.

If this method doesn't work, we can also plug the phone into the power supply at this time, and then press the power and home button on the home screen at the same time to see if we can turn it back on.

3. System crash.

If none of the above solutions work, and you see an iTunes connection screen on the screen of your iPhone 7, it means that the phone has entered recovery mode at this time. When this happens, the only way to do this is to restore the system for your phone.

The reasons why your iPhone suddenly goes black but doesn't shut down: Generally speaking, the black screen is caused by the software system and may be due to an internal conflict in the software you have installed. When the situation gets really bad, it reappears on the screen.

It may also be because the phone has been used for too long and the heat is not released in time. As long as you press and hold the power button (power) and exit button (home) for about 10 or so, it will force shut down and then restart. There are several ways to deal with the sudden black screen of the Apple phone but it does not turn off:

1。Force the phone to restart, power and home buttons at the same time, hold for more than 10 seconds before shutting down and then restarting. Figure 2.

Charging, if the battery is turned off because there is no power supply, the battery icon will appear on the screen. Also, the iPhone's battery needs at least 5% charge to turn on. If the battery is extremely low, charge it before turning it on.

If both methods work, it may be a hardware problem, and it is recommended to send the phone to an Apple authorized after-sales service store for testing.

It is recommended to find the official maintenance department immediately and ask the master there to help you take a look. i

iphone7 mobile phone turned on no response, black screen does not display, in this case it is likely that the landlord's mobile phone is out of battery, it is recommended that the landlord first go to charge the mobile phone for a while and try to turn on it to see if it can be solved. If the charging can't be turned on, then you need to go to the after-sales service to check whether there is a problem with the hardware of the mobile phone. ，<

Go to the mobile phone store to overhaul it, there are many reasons for the problem of not responding to the boot, and it is not good to judge if you don't see the real thing.

If you turn on the boot and press and hold the power button, the phone screen does not light up, you plug in the charger to see if the screen has a charging sign, if not, it may be that your screen is broken.

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.

There is no response after the mobile phone is turned on, and it does not show that this is likely to be a short circuit in the mobile phone caused by falling or water ingress, you can choose to connect the mobile phone with a charger to see if there is a conductive phenomenon.

If the battery has power, it is a problem with the phone and needs to be solved by a repair shop.

In this case, it should be a problem with the processor, and it is recommended to go to the aftermarket to replace the motherboard of a mobile phone to take a look.

iPhone7 black screen of death causes: system software crash, fall or water ingress, use of high imitation charger, factory quality and other problems.

First of all, you need to try to force restart the boot, here's how:

1. Press the "Power Button" + "Volume Down Button" at the same time.

1. Replace the original screen to test whether it can be turned on.

2. If it can't be turned on, it means that the motherboard is faulty. Motherboards have a lot of chips, capacitors, and power lines.

To determine which component failure causes the black screen, it is necessary for professional maintenance personnel to do it, and the method is roughly as follows:

1. By detecting whether the current value of the motherboard is too large, if it is too large, it proves that one or some components on the motherboard are caused by short circuit.

2. Take the lavender rosin method to test which component of the motherboard is too high, and professionals can see it by visual inspection.

3. After determining the specific short-circuited components, replace the short-circuited components through value shifting and welding technology.

4. Press the power button again to boot the test.

If it is successful, the problem is solved, and if it is unsuccessful, there are still other short circuits, and the above steps have to be repeated.

This process requires a very patient and experienced chip repair technician to make a perfect repair the first time, otherwise it will have to be restarted.

I have been in the professional maintenance department of Guangzhou Apple, and I have seen a lot of this situation.

Many small local repair shops have poor skills, and the machines that could have been repaired have repeatedly repaired the motherboard to a pulp.

First of all, you check whether the battery is charged, or charge it for a while before turning it on. If it doesn't work, you have to go to the after-sales service to deal with it.

The first question is to check if his battery is completely dead. The second is. Its screen is broken. Not showing the third is his show. and the motherboard of the running system. Broken. Such problems can also arise.

Apple iphone7 mobile phone suddenly black screen does not turn on. In the process of daily use, I believe that many users have encountered similar problems, maybe the phone will be solved after restarting, but if it is a hardware problem, you can't fix it. Today I will share with you the solution to the sudden black screen and not turning on the iphone7 mobile phone in use, let's take a look!

1. Preliminary diagnosis:

According to the previous maintenance experience, the Apple mobile phone will not turn on the black screen when it is used, and there will be several possibilities for this phenomenon:

1. It may be caused by a short circuit with poor performance of the motherboard;

2. Or there is a problem with the power supply, etc.

2. Fault detection:

1. Test the start-up current: first disassemble the machine, connect the adjustable power supply to look at the start-up current, and find that the current only jumps to 73 mA, which seems to be unmet.

2. Connect to the computer to see if it enters the mode: connect to the computer without prompting, and see that it is not in the mode.

3. Boot measurement conditions: The test found that the PP1V8 SDRAM power supply is only , and the normal voltage is.

4. Find the fault point: the voltage cannot be reached, like this kind of problem, which is generally caused by the virtual welding of the boost inductor, resulting in the voltage not reaching.

Third, the maintenance process:

Remove the inductor and find that the solder leg has fallen off.

Deal with the pad, and find that there is a loose one next to it, and deal with it together.

Replace the inductance. When the power is turned on, it is found that the current is restored and the jump is normal.

Fourth, the results of maintenance.

The installation test, the function is normal, and the maintenance ends here.

This fault is caused by the virtual soldering of the PP1V8 SDRAM power supply boost inductor and does not turn on.