Even modern gadgets are not completely immune from unexpected failure. It often happens that smartphones simply stop turning on, it is worthwhile to understand in more detail the causes of the breakdown and the solutions.
Devices often stop working if battery life completely used up. But such a problem occurs on mobile phones released a long time ago. Before that, the charge level may drop very quickly, charging takes too long.
One of the possible reasons why the phone does not turn on is that the oxidation process at the battery. In this case, it is recommended to get rid of the battery as soon as possible - there is a high risk that the battery will simply explode during further use. If the battery is swollen, it can be noticeable even through the case.
Hardware problems- the most common reason for the failure of the phone. Troubleshooting at home can be tricky.
The phone does not turn on - what to do
Perhaps the device itself works, but for one reason or another it freezes. The screen becomes dark, does not respond to any actions. The first solution is to restart using the hardware keys.
Force restart iPhone
The following instructions will help owners of such models:
- iPhone SE.
- iPhone 6s.
- iPhone 6s Plus.
Older models also allow a similar scheme. First, the key is pressed Home» at the same time as the top or side button. You need to hold the buttons for ten seconds. At least until no logo appears manufacturing company.
If we are talking about iPhone 7 models and the same, but with the letters Plus, you need to apply side key together with volume down button. Hold until the Apple logo appears.
In the case of new models, it is first clamped increase key, and then - volume down. Buttons are clamped and immediately released. After that, the side button is used. It remains to wait for the moment with the appearance of the logo.
Forced restart of smartphones on Android
Androids also require pinching and holding buttons for 10-15 seconds nutrition and volume down. If the operation was successful, the phone will reboot automatically, or a menu will appear on the screen, where one of the available functions will be restart. 
For some smartphones, other buttons are used in the event of a forced reboot. If the method does not work, you should search the Web for which key combination is suitable if the Samsung, Lenovo, Asus, HTC, Micromax, Fly or any other phone does not turn on.
In case of battery problems
One of the reasons is that the battery just completely sat down, because charging does not give any result, often the phone vibrates, but does not turn on. This situation is one of the most popular, but there are other types of circumstances:
- The charger is broken. Devices fail especially often if they are not original, but Chinese crafts. Then you can look for another charger suitable for your smartphone and try using it. An alternative option is to recharge via a computer from USB.
- Expended work resource devices. The battery often wears out in phones that are used for a long time. To check this fact, use a multimeter. Measure the voltage at the battery contacts. If it is insufficient even after a full charge, you should make a choice in favor of purchasing a new battery.
- A separate check is made for battery contacts on a smartphone. The phone often does not boot due to poor connection, dirt getting inside.
- Charging socket is dirty. When charging modern phones, open microUSB connectors are used. Contacts are clogged with layers of dust, which is why charging stops working correctly. Then it is better to turn off the device, and then clean the entire connector.
- Broken power button- Another reason why the phone does not respond to turning on. In the case of new smartphones, this behavior most often means the presence of a marriage. It is worth taking the model back to exchange for the same, but new. Otherwise, only an appeal to the master, who will be able to competently replace the buttons.
- Burnt power controller- one of the worst options. It is this detail that is responsible for the process of charging the gadget. In this case, you only need to contact the service center.
If the phone does not turn on, the user can deal with most problems. The main thing is not to discharge the gadget to zero too often, only in this case the service life is extended. It is recommended to use only certified charging devices from the manufacturer.
Memory card problems
Sometimes problems arise because of what is inserted SD- card not supported one or another phone model. Because of this, there are failures in the program codes, the device cannot be turned on. In this case, you just need to pull out the memory card, which is not suitable. If activation does not occur after that, it is likely that the smartphone will have to be reflashed.
You should carefully study the specification that comes with the phone. It says how much memory cards are supported by the phone, which options are compatible. You can also get advice from sellers in salons. 
If the system is not updating correctly
Smartphones can also turn into a “brick” when the system has been updated, or the settings were reset, but the actions were not performed correctly. Then the usual inclusion method is no longer suitable. Reverting to factory settings is one possible solution under such circumstances. For this, the so-called Recovery mode is used. To enter it, the following steps are performed:
- Pressing a key for volume up.
- Key hold Home. The previous one is not released.
- Parallel pressed power button.
Some smartphones enter this mode if you press the button at the same time. Inclusions, decrease and increase volume. Use the volume keys to navigate to a line called " wipe data/ factory reset". After that, it remains to confirm the choice by clicking on the item " Yes – delete all user data».
In addition, the user can clear sectionscashanddata. But after this step, all personal data will be lost, so special care is required. It is better to contact the service center staff if there was something important on the phone.
If the download freezes at the moment the brand name of the operating system is displayed, resetting to factory settings is also relevant. In this case, the problem lies in the fact that the hardware is not working properly.
Some devices are equipped with a special button that is used when rebooting - it is pressed with a thin needle. This also applies to iPhone models.
Action of viruses
Often the Android phone does not turn on due to the fact that a virus has entered the system. Or several at once. Here you can not do without flashing the device. Some service centers offer services to clean the device from viruses, which allows you to restore functionality. It is recommended to install antiviruses and programs only from the official Play Market in order to avoid such problems.
For mobile devices, programs like Dr.Web, ESET are great.
broken screen
The phone may not turn on if the screen is broken, there may be several reasons for such a malfunction:
- display failure;
- water ingress into the structure;
- faulty loop.
You can also try make a call to the device. If the sound goes on, but nothing happens, then the problem is definitely in the display.
Power button damaged
Such a problem is more likely to affect devices that have been in active operation for a long time. The same applies to goods that are initially defective. There are two options for such situations:
- Attempt to turn on. The smartphone turns on after two or three times. But the number of attempts can increase if failures were noticed before.
- Shipping to repair center. The problem is not so serious, it will not take much time to fix it. And the cost will be low, especially for devices under warranty.
Physical Damage
Failure also occurs due to mechanical impact on the device. In this case, the case can remain absolutely intact, which makes it difficult to externally determine the problem. Internal mechanisms in this case suffer more often than others.
What leads to such breakdowns:
- superfluous pressure in the bag;
- exposure to direct sunlight, if the phone is left in the sun in a car;
- damage animals, small children;
- strong squeeze in pockets;
- telephone fell on the ground.
Self-opening in such situations is not desirable. It is recommended to immediately contact a specialist.
The same applies to cases with moisture getting inside, other types of damage. 
The phone does not turn on after the splash screen
Contacting a service center for diagnostics is the most reasonable solution if the phone does not turn on completely. Only mild software failures can be dealt with on your own by choosing one of the methods indicated above. If there is no result, then only the service center.
Phone charges but won't turn on
In this case, the following reasons could have occurred:
- Charging is not complete. Some devices, after being completely discharged, must be charged to a certain level, usually this happens within 10-20 minutes after being connected to the charger.
- Firmware usage. To reset the settings to the factory settings, the hot keys mentioned above are clamped. If it does not help, contact the Service Center.
- hypothermia. The device often turns off if it is too long in a place where the temperature is constantly negative. It is better to wait until the device warms up a bit. And then connect to the network.
- Battery problems. Then one of the solutions described above is suitable.
Android won't turn on after factory reset
In this case, too, there are several solutions:
- contacting the workshop
- flashing android;
- leave the smartphone on charge for at least 3 hours;
- pull out the SIM card along with the memory card and try to turn it on;
- pull out the battery for 20 minutes and press the power button to de-energize the circuits, then assemble the device and turn it on;
- try to reboot.
Crashes in the operating system- the most common reason that the phone refuses to turn on. Do not stop processes while they are running. Sometimes the issue is resolved by a deeper reset for the operating system. 
How to turn on a touch phone without a power button
The easiest way is to connect to the charger and while the process is in progress, it remains to hold down the button volume changes.
If the charge is not completely used up, it is permissible to connect the phone to a computer or laptop via the USB connector.
The third method involves installing the Android SDK on your computer. This is a special tool that allows you to use personal computers to manage mobile devices. You will need to connect your smartphone via USB, and then register using the command line adb reboot. If everything is correct, the device will reboot. But for this you need to set certain settings.
There is a solution for phones that won't wake from sleep - connection to charger the device will be woken up by the smartphone. Can shake phone if available, or make a call.
Gravity Screen is a special application that allows you to control smartphones without using the power button.
Most of the problems are fixed by the user himself. If not, then you can always contact the staff of the nearest service center.
On the Internet, you can often find messages from owners of android devices that tell how users unsuccessfully played with gadget settings and what came of it all. In most of these cases, it is recommended to reset all parameters to the so-called factory settings. However, it may happen that after such a reset, the android simply stops turning on.
Android won't turn on
If, after resetting the settings, the android does not turn on, you should not immediately run to the service, as in some cases, the problem can be solved on its own. There are quite a few reasons why, in view of which, it is necessary to check everything possible in order to exclude erroneous diagnostics.
First you should try to connect the charger and look at the reaction from the gadget. We must not forget that many modern devices have an unpleasant feature - when they are completely discharged, they do not respond to the charging connection for some time, which is why you need to wait at least half an hour.
If you were reset through the familiar android interface, and not through code or system flashing, you can try using a deeper reset. To do this, you need to find out and dial a special reset code on the device, entering which will lead to the complete loss of all data, but the device will be able to turn on.
Difficult situations
However, all of the above methods may not give the desired effect, which will lead to the need to reflash the device. This operation should be performed independently only in cases where the user is firmly confident in his skills and abilities to carry it out. Otherwise, it is better to let specialists take a look at the gadget so that they can quickly fix existing problems.
During flashing it is extremely important:
- Provide access to the gadget to charge in order to exclude the possibility of an emergency shutdown or disconnection during the firmware process;
- Monitor the stability of the connection between the computer and the android smartphone or tablet;
- Use the recommendations of the manufacturer of the device in the process of performing manipulations.
Only by observing the above rules, you can count on a positive outcome of the flashing. If it is carried out incorrectly, then all the efforts of the user will be in vain and you will have to start the procedure from the very beginning.
4 years ago
Hello. Today I would like to analyze all the most common reasons why an Android smartphone may not turn on. I will not touch on those situations when you need to disassemble the phone and interfere with the electronic stuffing, since this is the work of completely different specialists.
If your smartphone or tablet suddenly stops turning on, it is not necessary to immediately run to a service center or workshop and send it in for repair. Most likely, there is a chance that you can manage on your own and save some money (home accounting programs for Android will also help you save, look for them on the blog). Below we will consider the main measures that can be taken if an Android smartphone or tablet does not turn on. And so, let's get started.
Android phone does not turn on. 5 ways to solve the problem.
Method number 1
From my own experience I will say that in 80% of all cases, if they come to me with a problem that the phone does not turn on, the whole thing turns out to be a dead battery. And I perfectly understand when they tell me that they charged the smartphone all day, but it still does not turn on. Some devices have one unpleasant feature - if the battery is very much discharged, it will not charge, even if you support it on charge all day.
In this case, a frog-type charger will help us, which allows you to charge almost any battery directly by removing it from the phone. It is enough to recharge the battery in this way for 15 minutes. After that, insert it back and put the phone on charge as usual, everything should be OK.
If getting a frog is problematic for you, then you can use any old mobile phone charger. Cut off the old plug and protect the wires.
Make sure that the charger is not connected to the outlet at this time.
We fix the bare wires on the battery with adhesive tape for a few minutes.
Important. Do not reverse polarity.
Method number 2
Faulty charger. Of course, the second thing to check is the health of the charger. Everything is simple here - we take a known working charge and try to charge our smartphone. If the process has begun, then we buy a new one and rejoice. Although it sounds trite, it helps every fifth person.
Method number 3
If the phone does not turn on, then it may just be frozen. To revive your device, we use a long-known, but still relevant method - take out the battery and insert it again.
Unfortunately, this technique does not work on many modern phones with a non-removable battery. In this case, to reboot, you need to find the reset button and press it, for example, with a paper clip. It can be anywhere, but is usually located near the SIM card slot or on the back of a smartphone or tablet. Near the reset button, sometimes there is an inscription reset or off. The photo below is an example of the location of such a button in a smartphone.
Method number 4
This method is applicable if your phone does not turn on, but does not turn on completely. For example, it hangs on your Android logo and nothing else happens. This happens due to a malfunction in the software of the smartphone. Then a hard reset or, in translation, a hard reset will help us. It is done differently for each device model. In order to find out how, enter the name of your phone and the words hard reset, for example LG G3 hard reset, in Google or Yandex and follow the instructions. In the future, I hope to create a separate section on the blog on this topic.
Unfortunately, not all smartphones support hard reset, it depends on the recovery installed in the device. If you are interested in learning more about what it is, look on the Internet.
For example, there is no such function by default in many Sony phones, but the manufacturer has provided the ability to restore the software using a special Sony pc companion utility.
Method number 5
Not often, but it does happen smartphone does not turn on due to the fact that the contacts under the battery do not reach. To fix this, you need to bend the contacts with tweezers or a small screwdriver to improve the connection to the battery. The main thing here is without fanaticism, otherwise you will only make it worse.
If none of the methods helped and your phone still does not turn on, then the problem most likely lies in the hardware itself and only a service center can help you.
Sincerely, Ivan Derbenev.
Possible reasons:
Operating system failure
Try restarting your iPhone
It is possible that the iPhone is not turned off, but simply frozen and does not respond to button presses. To reboot (Soft Reset) the device, press and hold the Home and On / Off buttons for about 20 seconds. (Sleep/Wake mode).
eternal apple
In this case, a flashing of the iPhone is required, because. an error has occurred in the operating system.
First you need to put your iPhone in DFU mode (stands for Device Firmware Upgrade). You can do this in the following way:
ATTENTION!
If you did not back up your data, then all information will be lost.
If you have a locked iPhone (USA and other countries), then your iPhone will become locked and will not be able to make calls. Requires unlocking. Refer to the relevant help section for detailed information on the unlocking process.
Device won't turn on after Jailbreak
A flashing of the device is required. First you need to put the iPhone into DFU mode (stands for Device Firmware Upgrade). You can do this in the following way:
1) Connect your iPhone to your computer via cable and launch iTunes. It doesn't matter if the device is on or off;
2) press and hold the Home and Power buttons (On / Off, it's the Sleep / Wake mode button) for exactly 10 seconds;
3) do not release the Power button, but keep holding the Home button for another 10 seconds;
4) On the screen of your computer, iTunes should report that an iPhone was detected in recovery mode. If you see this message, then you have successfully completed the transfer of the device to DFU mode.
Click the OK button to close the window, then click the Restore button and follow the iTunes prompts.
ATTENTION!
Use the jailbreak method that is compatible with your version of iPhone and iOS.
Carefully read the instructions for Jailbreak
Device won't turn on after resetting settings and content
This happens after you have selected the option to reset all settings in the settings, and the operating system has undergone the Jailbreak procedure. A flashing of the device is required. First you need to put the iPhone into DFU mode (stands for Device Firmware Upgrade). You can do this in the following way:
1) Connect your iPhone to your computer via cable and launch iTunes. It doesn't matter if the device is on or off;
2) press and hold the Home and Power buttons (On / Off, it's the Sleep / Wake mode button) for exactly 10 seconds;
3) do not release the Power button, but keep holding the Home button for another 10 seconds;
4) On the screen of your computer, iTunes should report that an iPhone was detected in recovery mode. If you see this message, then you have successfully completed the transfer of the device to DFU mode.
Click the OK button to close the window, then click the Restore button and follow the iTunes prompts.
After a hit or fall
Try restarting your iPhone and connecting it to your computer
It is possible that the iPhone is not turned off, but simply frozen and does not respond to button presses.
To reboot (Soft Reset) the device, press and hold the Home and On / Off buttons for about 20 seconds. (Sleep/Wake mode).
If the computer sees the connected iPhone, then all is not lost. First, back up your data to protect yourself from data loss.
When the iPhone falls, one of the many devices could fail. As a rule, the consequences of mechanical damage are corrected in the service center.
What should I do if the tablet stops turning on after a factory reset? In fact, there are several solutions to this problem. As usual, there are simple and more complex ways to solve this issue. Let's start, of course, with the simplest ones.
So, the easiest way is the usual waiting, because some tablets (especially low-power ones) can boot after a hard reset for about half an hour, you need to understand this. By the way, after flashing the situation is similar.
What else can be done? You waited, but it’s no use, then try resetting the settings again using Recovery, you need to find the “factory reset” item there. It is likely that this will help start the Tablet PC.
Bootloop
If the tablet freezes on the power-up splash screen and, for example, the loading circle is spinning, or a robot with a ripped open stomach is shown, or a logo is simply displayed, then in this case ONLY a flashing can be done. This state is called a bootloop. After resetting the settings, this may happen due to the cryo-handedness of the manufacturer's programmers. This is often found, for example, on smartphones from Ulefone.
It is extremely easy to solve the problem through flashing using the SP Flashtool utility, if, of course, on board Mediatek (processor), if Spreadtrum, then use the UpgradeDownload utility. By the way, there are a wide variety of solutions for those devices that have Qualcomm Snapdragon under the hood. If you yourself cannot cope with this, then contact the RuleSmart forum, in the first aid section. Experts will advise you for free.
