What to do if the iPhone screen is black and it works himself. What to do if the iPhone screen is black and does not turn on

Like the whole technique, Apple's devices are not eternal, but they can break over time. One of the most common breakdowns is when the iPhone turned off and does not turn on. The reasons for this can be very different, and depending on what the problem was caused, one or another method of solving it is used.

Today's article will be devoted to this kind of problems with "apple" gadgets. After reading it to the end, you will learn how to cope with any kind of breakdowns of your smartphone, and what to do if iPhone 4 does not turn on, iPhone 5S does not turn on or any other phone model.

However, we note that if your iPhone does not turn on and it has seriously suffered - for example, after falling from the fifth floor or it has been in water for a long time, then the methods described below the device is hardly useful. In such situations, it is better not to slow and immediately contact service center. Well, for those users, whose iPhone does not turn on, and it happened suddenly and without visible reasonsOur recommendations should help.

We also note that there are mobile devices stopped turning on without any visible reasons, most likely, it was influenced from outside. Since so smartphones are usually not broken. Especially if we are talking about Apple's devices.

The most common situations of the breakdown of "apple" smartphones are given below, as well as the options for correction.

A very frequent problem at which the iPhone 4S display does not turn on, but remains for a long time Black, and he does not turn on, whatever actions did the user. And this can happen not only with the outdated "four". Often the iPhone 5S does not turn on, too, what the black screen appears as follows.

As a rule, "to blame" in such situations a fully discharged battery, which needs to be charged some time, and then try to enable. Just the phone was discharged and does not turn on. But perhaps the case in freezing operating system. Very rarely, in 2-3% of cases, the case in the flying firmware, but the solution to the problem in this case will be somewhat different than in the first two mentioned above.

So, if the iPhone, or rather, its screen is black, and the phone does not turn on even after charging, you can try to take the following steps:

1 If the gadget owner has long lasted the device in the cold, it is quite possible that the cause of a malfunction in this. Batteries of mobile devices poorly carry low temperatures, and in such conditions can very quickly be discharged or hang. What to do in this case? Try to warm the device in the palms. If it did not help, try the second step. 2 You just need to connect the device to charging. Perhaps the device was discharged 100%, and the reason for the gadget failure is in this. If after 10-15 minutes of charge the device does not respond to the inclusion, it means that the problem is not in this. Then we try the third way. 3 It is necessary to make the simultaneous press of the Home and Power buttons (on the iPhone of the seventh version - Power and Volume). Wait 20 minutes until the display of the apple appears on the display, after which the download buttons. The operating system should boot. 4 You can try to turn on and turn off the switch the silent mode several times, sometimes it helps, although there is no reasonable explanation. Such a procedure should be done before the second step is fulfilled. It sometimes gives a positive effect if the buttons are pressed.

If the above-mentioned action did not give any result, it means that the problem is very serious. For example, there may be a breakdown of internal elements, failure of the charger or anything else. You can try to take another charging (for example, a relative or colleague), and connect the gadget to it. If the situation is not corrected, and the phone will not charge, and the display will be stored black, you need to carry the device to the repair workshop.

You should not ignore the charging fault option. As the experience of users shows, it is this component that most often fails, and maybe even burn. After a few months of operation, especially with an inaccurate handling, the cord in any place may be damaged, and the current will not pass on it.

Attention! Use exclusively original charges that are coming with an iPhone. Chinese fakes are rapid heating and are often melted during charging. The burning cord of China's production - the phenomenon is not so rare.

Dedified iPhone refuses to turn on

The reasons for this problem may be several:

1 contaminated Lightning - port. It is no secret that the majority of the population wears smartphones in the back pocket pants, and also does not place a fragile device in protective covers. Of course, with such an inaccient operation, a lot of small dust falls into the device case. How to fix this problem? The solution is simple - clean the gadget from dust, for example, with the help of toothpicks. In the process of cleaning, it is recommended to get to each corner in the Lightning connector. But you need to work very carefully, so as not to damage the fragile detail. 2 USB - port is faulty. I charge the gadget, the first thing you need to check if the cable is working. Perhaps faulty connectors. It is not known what it is connected with, but through some connectors the smartphone does not receive charge. 3 If it's about this, try using another cable. You can also try to connect to another 220 volts socket. 4 Problems with a charge device or cable. The fact is that many users, saving money acquire Chinese charging. They often break and quickly cease to perform their functions. Therefore, once again we will recall that it is better to use the original components. The Chinese fake can cause irreparable harm to your device, causing breakage. But if you still decided to buy a fake charging, and if it does not work when the first connection does not work, that is, the phone does not charge, stop using it immediately.

What if the iPhone hung?

Usually, the phone from Apple hangs in the application. Or does not hang, but ceases to work normally. In this situation, it is necessary to forcibly close and restart the device. To do this, you need to click on the HOME button and swipe top remove unnecessary app.

When the "apple" gadget does not respond to pressing the buttons

Users noted that the situation when the device stops responding to pressing the buttons, quite frequent. At the same time, the display shows the last screen of that application, which was used until the device depended. It will take a rigid system reboot. How to do it, it was said earlier (by pressing the POWER and HOME buttons).

If the iPhone does not turn on the apple, what to do?

If the iPhone turned off and does not turn on what to do - which question is often asked for inhabable users. Sometimes it happens so that iPhone device 4 does not turn on, but at the same time the display lights up, the image of the Apple logo is faded. This means that the device is hung on the apple. By the way, it often happens that when such signs of iPhone 5 appears, the iPhone 5c does not turn on, and other models of "apple" devices are refused to work.

If the iPhone goes out, and then an apple lights up, then the reason for this one of the 3rd:

Unsuccessful IOS operating system update process in iPhone 5S, iPhone 6S, iPhone 7, iPhone 6 Plus, iPhone 3GS and other phones.
Corywood jailbreak.
Failure when restoring a backup system (one of the most frequent reasons why the iPhone does not turn on).

With this situation, the user might think that the device is hopelessly broken. But this is not always the case. You can try to fix everything.

In most cases, if a mobile device does not turn on, the problem is solved by a system recovery procedure, for which you need to do the following steps:

On a PC or laptop, the opening of the Aytyuns utility. Connect to computer USB cable, but your smartphone is not connected.
Turn off the phone holding the HOME and POWER buttons.
Press the Home button, connect the cable to the phone.
Do not let go until the iTyuns logo and plug appear on the screen.
The computer will display a message that the device is in the restoration state.
And now you just need to click on the recovery button, then the computer will do everything yourself, namely, it will be downloaded from Apple servers the newest iOS versionAnd then becomes it on the iPhone.

Note that for the procedure described above, you need to have a high-speed connection via Wi-Fi.

Application DFU mode for inclusion iPhone

What to do if iPhone 5 and other, newer versions of the device - iPhone 6 does not turn on, iPhone 7, iPhone 6s suddenly disconnected, but does not turn on. In this case, the display can suddenly light up, and then ground, i.e. The device responds several times to touch the user to the power button, and after will turn off "forever".

If, after applying all methods described above, your device does not turn on, it remains to use the latest method - DFU modes. This is a special mode of operation of the phone at which the firmware is updated.

This mode is used in the following cases:

The device refuses to charge when iPhone 6S does not respond to current flow through the charger. With such situations, the device is capable only completely discharged and disconnected. For user feedback, i.e. Attempts to include. It does not react in any way.
The iPhone does not turn on with any user actions (iPhone 6S, iPhone 3GS and others).
It is impossible to restore the system by other methods.

To the iPhone entered into this mode, you need to do the following steps:

Connect the gadget to a PC or laptop through the cable, plus run the Aytyuns utility.
Within 10 seconds at the same time click on hOME buttons and Power.
Continue to hold down the 1st button while the Recovery Mode message appears on the screen.

If everything has passed successfully, no special messages that the device entered this mode should not appear. Next, you need to restore the firmware, for which you want to click on the appropriate button to start uploading. The system itself will do everything in 10 - 15 seconds, and after that the smartphone will restart, and starts to turn on and operate in normal mode. In this case, the screen will not be turned on, and for a while it will turn off, i.e. The display will have time to go out during this time.

If none of the ways enable iPhone You did not help, and after applying all possible methods Inefone 6S or any other model of the phone, contact a service center. Experts will diagnose and identify the true cause of this malfunction. In this case, it is necessary to blame, obviously, not the discharge of the device and not shutting down without visible causes, but more serious faults in the "stuffing".

25.02.2018

If the iPhone does not work the screen that not all owners know, and meanwhile the question is very and very relevant: the cost of the display is large, so the replacement for ignorance can lead to unnecessary spending. To avoid this, it is important to know two things: the causes of the emergence and ways to eliminate the problem without harm to the phone.

The screen stopped working on the iPhone 4

Before riding in a panic and look for tips, where you can, check if your device does not depend on. Yes, apple devices Almost do not hang, thanks to which such a phenomenon is taken for breakdown. A broken screen In this case, it is easy to restart (hold off and sleep / home button). In the event that it helps, but repeats often, immediately contact the service - the screen is in order, but the system itself or the "Shalyat" components are needed.

If the reboot did not help or the apple symbol does not appear - go to the next item. Another reason why the screen does not work on iPhone 4, maybe his Chinese origin: non-original technique breaks very quickly, not to mention the fact that its repair exceeds the cost of the product itself several times. Hands to buy an iPhone with hands rather doubtful. Think, do you need it? Yes, you will save several thousand rubles, but then go off on replacements.

After infusion, the screen does not work on iPhone 4S

"Official" your device, you risk finally soaking it, so you can do the following as soon as possible:

Turn off the phone;
Disconnect the battery (you need a screwdriver for small bolts, it is screwed);
Wipe the visible water;
Put an iPhone into a container with rice and leave one day.

After that, the device may turn on, but it is better not to risk and contact the service. Instead of rice, you can use a hairdryer or a special case, however, in the case of a hairdryer there is a risk of damaging the insides and finally "kill" the device, and in the second price of the cover can be higher than the repairs price of honest masters.

IPhone 4 screen does not work: what to do

Check the battery charge before disassembling

The first thing to start diagnostics is to check the charge level. Oddly enough, one of the reasons for people's appeal to Apple services is banal forgetfulness: a fully discharged phone may not be included even when working from charging, which particularly prone to panic people perceive for breakdown.

If everything is fine with charging, inspect the iPhone. The screen does not show, but everything else works - you should once again think if you or someone ever ever had a device, because the remaining moisture is cunning and harms all the device slowly, even if he worked before. There were no such cases? Well, you are a very neat user, therefore the reason for the fact that the screen has stopped working, the sound is there, and the calls take place, is either a screen breakage as a whole or a deposited loop.

Having the experience of assembly-disassembly of complex electronic devices, you can independently disassemble your iPhone and check the reliability of the fastening of the loop, however, remember: if you have a guarantee, you shouldn't do such a phone, then any service will call the warranty due to opening.

No guarantees - no fears, you can check. In the case of a correctly looking loop, it is better to take an iPhone for examination. Tip for winners of kinescopic televisions and screens (if there are still remained): do not put the device on them, the screen does not work for the iPhone after a long lying. Helps or charging with a reboot or service. The effect of the kinescope on the iPhone screen is noticeable.

IPhone works, but the screen does not burn

Often under "not burning" Users mean the insufficient level of backlighting than confusing the masters. In the event that you simply glow the screen, but the picture on it is clear and the device's good response, increase the brightness in the settings - will help 100% if the firmware is original and correct. Non-working backlight changes may be the cause of the update error, it corrects the firmware that it is also better in the service.

If you do not want to refer to such a little thing in service, try resetting the settings to factory, can also help. Do not get carried away by unauthorized flashing: the same Jailbreaks are able to implement a malicious code into the system, causing incorrectly to function separate iPhone nodes.

Choose service

Quality Service - IPhone Pledge

"Iphone works, but the screen is black? What to do - you know our masters! " Such a statement in different forms is found in contextual advertising, and in paper advertisers, the essence is one: to take you as a client. Do not get on discounts and free diagnostics: The licensed service takes money for the diagnosis, but then it deducts its amount from the cost of the service. What to pay attention to when visiting:

Availability of service center in the official list apple services. You can be found in the community and on the site;
Reviews. You do not have the first screen on the iPhone, and therefore, with a similar problem already appealed, and in the reviews it can be described. It is important to check the reviews not on the official website, but, for example, in social networksSince the reviews on the site in 95% of cases are written by the owners of the service;
Status of the room. In the basement, in which mushrooms grow on the walls, it is better not to handle;
Price. Replace the display for 500 rubles. Professional service centers are unlikely to take. Low price Should alert.

By the way, who promise "only original spare parts" services are often shovel: Apple's original spare parts, there are high-quality Chinese counterparts. The paradox is that the phones are releasing the same details from which high-quality replicas are collected. After the apparatus, do not forget to take the act of reception of technology for repair, in which your iPhone identifier must be specified.

Apple phones are known for their convenience and reliability, but even good techniques have a technical fee. Both as a result of irregular operation and as a result of marriage in spare parts. In today's article we will analyze the question of what to do if the screen does not work on iPhone? It is the screen when all other functions of the device are in working condition. You can receive calls, but it is not seen that on the display. I will identify all the reasons and tell about solving this complex problem with an expensive phone.

Causes of breakdown

Causes before banality are simple, remember whether similar to the iPhone 5 happened in the foreseeable past? If yes, then the article is for you.

The iPhone fell on a solid surface - the display loops from connectors could fly out.
Strong pressing on the display module
The device fell under water - the injection of water and the closure of vitality chains.
Strong heating gadget - chip damage
A mistake in software (iOS)
Popular repair Mount Masters (hands tear)

Frequent problems

First you need to understand what happened to the phone, we will examine the main causes of the breakdown before you begin to solve the problem. The reasons, the screen on the iPhone, maybe many.

Display does not turn on, the phone works

A widespread iPhone glitch when the display does not turn on, and all the phone features work, the call passes, Siri responds to requests, etc. Sometimes it can be seen that the backlight is turned on, but does not work screen iPhone 5s - just black, without an image, even the sensor responds to pressing.

How to eliminate when the iPhone 6 went out the screen and does not turn on the call passes, we will disassemble in the following chapters. So far, you need to find out why it arises to understand what kind of situation you have.

The display is turned on, but partially or completely does not respond to pressing

The reasons are the same as in the case when the screen is on the iPhone, read about them in the previous chapter. It is necessary to clarify the symptoms of the non-working touchscreen, to solve the issue with it correctly.

In this case, the problem is exactly the screen sensor that suddenly stopped working in whole or in part. This may occur due to a blow or other mechanical damage to the matrix. In this case, the glass of the phone will remain whole, without cracks, but it will not be able to work as a system, for example: for example:

iPhone does not respond to pressing
Very long responds to user actions
7, 5, 6 does not work part of the sensor
IPhone lives his life without paying attention to pressing

Strip on display

The band on the iPhone screen can embarrass any user, even savvy and capable without instructions, to make a hard reboot of the device. It is not necessary to get upset, perhaps until expensive repair does not reach. What to do when the iPhone screen does not show, consider in the next chapter until we stop on the symptoms.

Bands can be solitary or throughout the sensor - a problem with a loop or connector
Colored or gray and black - a problem with a loop or connector
Appearing flows on the monitor - in this case, only replacement for a new part.

The strip on the iPhone screen is a reason to contact the service center. Or, if the iPhone does not work properly, to open it yourself and check the integrity of the monitor loops, cameras. You can carefully disconnect all the conductors and re-connect them, it happens that it helps remove the multi-colored stripes from the screen.

A yellow spot appeared on the screen

A rare variety of problems with the iPhone display, when yellow spots appear on it, there may be several or one. The iPhone display is a fragile thing, it is enough to attach it about a solid surface, as difficulties there are difficulty.

Before continuing, you need to clarify, the yellow spot on the iPhone screen is glue. If they appear on new iPhone 5, 6, 7, 8, you should contact the warranty department, you must change the device without any questions. Or you can wait for 2-3 months, before applying, the glue should dry and the problem will leave by itself.

If yellow spots appeared in the process of using the device, for example, in a couple of years after purchase, then it is worth thinking about replacing the screen entirely.
The iPhone battery has failed and began to swallow, in the literal sense of the word, gives out the screen from the inside.
Recent repairs, apparently done not in the best way.

Decision

The solution of technical problems is quite universal, we try to do everything on the list and with a large share of probability, the phone will ventilate and will be happy to please the stable job.

If on iPhone 5, properly shows the screen, first - we remove the protection, remove the case, protective film, other "decorations and rushes".
When the phone itself works, takes calls and the backlight is on, and the screen does not work, it will help the "hard reboot" of the device. To do this, presses and keep the "Power" and "Home" key, after 5-10 seconds the iPhone will go to the reboot, and in 80% of cases it will work as it should.
The strip on the iPhone screen can be caused by the recently installed "jailbreak", as this pirate application affects many functions of the device. Therefore, we try to remove it from the phone.
If the phone screen does not work after the strike, then it is worth viewing the flailing of the screen module, it could suffer when dropping, the verdict is the replacement of the entire module.
The extreme option is when nothing helps is replacing chips and broken modules. It is better to overpass a module for units, better do not try for themselves, and give to masters who have special equipment for manipulation data.

Question answer

How to turn off an iPhone if the screen does not work, but the backlight works?

You need to try to restart it, clamp the "POWER" and "HOME" keys, after 5-10 seconds, the iPhone will restart.
Alternatively, waiting for a battery.
Get acquainted with this article by clicking on the link.

What if I dropped an iPhone and he does not give signs of life?

Read the article, upstairs described many ways to revive the device.

The phone calls, you can take the handset, but the monitor does not burn, does not show the information, how to be in that case?

We try to make the list described in the "Decision" section.

And in conclusion, on a good tradition, video instruction.

Video instruction

From year to year, apple company offers new gadgets that continue to suffer from old problem - Sudden displays. This is expressed in the absence of an image when the device itself is completely properly.

Before you go for help in a service center, the user is able to independently diagnose the breakdown and accept attempts to fix it. Next, you will learn what to do if the screen does not work on the iPhone and for what reason it could happen.

Initially, the user must remember whether it did not happen to his phone, something extraordinary. For example, he dropped an iPhone and the screen does not work now. Consider possible causes of malfunction:

Mechanical breakdown. This includes strong blows or falls, resulting in damage to the display or its loop.
The application installed earlier was terribly optimized.
Device could fall into the water or overheat.
Need full reinstalling firmware.
Poor-quality details or fake phone.

If one of the options corresponds to the reason why you stopped working the display, look for answers below.

Mechanically damage

It is worth the device only to fall to the floor, how you can encounter a problem that the iPhone 5S screen does not work. For a person who has never happened in life with repair mobile technology, eliminating such a breakdown will be quite difficult. After all, if the screen does not burn, the hardware components are damaged, check which is possible only after opening the case.

So, the problem with the loop can be expressed. After hitting, it is able to fly out of the socket because of which the power and image transmission on the iPhone display becomes impossible. Experts fix it back, after which they are collected again. Then, there is a diagnosis of its performance. If it does not help, then only the replacement of the screen module is becoming the only output.

It is better not to risk a smartphone, but to contact the service center, where professionals will be engaged.

Another reason why the device was pressed to work as it should have been hanging completely. They cause crash in the software and inclusion display iphone It becomes impossible. Fortunately, everything you can decide waiting for the battery or early reboot of the device.

To do this, clamp the home button and the lock button for 10 seconds. If the reboot helped, you can safely exhale. However, it is better to observe the further behavior of the device. Without deep diagnostics, such malfunctions may appear again, which should be a faithful push to seek help from specialists.

Wet or overheated

There is no breakdown worse than that was caused by moisture or overheating. Most of the problems appear after the influence of the smartphone, be it a fall in the tank with water, or a large number of Rain droplets.

Immediately after contact with water, the smartphone needs to be wrapped with a dry towel and wait, as long as the excess liquid will be released, followed, the gadget should be carefully dryed, but not using hot air.

After such an incident, touch screen The iPhone can suddenly extinct and often stops responding to any user actions, and this may mean one thing - the complete replacement of faulty components.

There are no better things with overheating. It arises due to a constant load on central process or the effects of external factors like direct sunlight or open fire. From this heavily suffers from the gadget chip, where the module is located responsible for the transmission of the image. It is impossible to repaid it independently without special skills and tools. More details with similar problems you can get acquainted by moving on.

Requires a new firmware

This is the most unexpected, with which only can cross the owners of "apple" devices. In such cases, it is not necessary that the screen stops working completely, it can only exit the brightness setting when the images remains, but to see it becomes hard.

It is worth paying attention to the firmware, more precisely, the failures in its work. They can manifest themselves immediately after during a scheduled update, the phone will be prematurely disconnected due to low battery charge.

To solve this eliminate a malfunction, do the following:

roll back the device to factory settings;
install the new firmware.

With the first point you can cope on your own, most importantly, do not forget to move important information on PC or cloudy storage.

The second option is suitable for those who have experience in working with reinstalling software. The only problem will be Jailbreak that most users use. This program is capable of implementing malicious code in advance to obtain credit card data, accounts and phone owner passwords. Therefore, it is better to contact official service Apple user support.

Fake phone

No matter how strange it sounded, but on the market mobile devicesThere are accurate iPhone replicas. You can buy them with both hands and unscrupulous online stores. At the same time they exactly copy appearance Gadgets and IOS shell, when in the hardware plan, most fakes are not capable of anything. Solving the problem with the screen, in this case remain the same, however, by contacting the SC, it is necessary to immediately indicate that this is a replica, not the original.

But with real iPhones things are much worse. The famous brand does not release the details for replacement and specialists remain only to look for a decision on the side. For example, repair iPhone Can be carried out with the help of "donors" or components that are used to create high-quality replicas. Original spare parts Tachkrins are obtained only from the same models that have failed before, while maintaining some of the components.

By contacting the nearest service center, there is a possibility that the client device will be installed a poor-quality display, Chinese production. Therefore, immediately after the work done by the masters, be sure to take the act, indicating the repair of your device in this center. If the problem again gives itself to know, it will be easier to prove the guilt of the employees of the SC.

Conclusion

As you already understood, the reasons why the display of your phone could be out of order. Starting from a banal fall to the floor or strong impact, ending with the purchase of a replica or replace the original components into Chinese counterparts.

Unfortunately, to solve most of the faults, without having experience in repairing phones, it will be impossible. Therefore, in advance, take care to find a quality service center, where you will completely replace the display, or the module failed.

Let the probability of substitution of original components on the Chinese analogue, it will be significantly cheaper than buying a new gadget from the American manufacturer.

Video

Display failures are a frequent problem from the iPhone 8. The malfunction may appear unexpectedly: you just worked the smartphone, and a minute, the screen illumination is no longer activated. How to be if iPhone 8 went out the screen? Should I immediately run to the service center or can you try to independently resume the performance of your favorite smartphone?

Causes of damping screen

If an iPhone is an extinction screen and does not turn on, there are a number of possible causes This phenomenon. The most frequent of them:

The penetration of moisture leading to the oxidation of the connectors on the motherboard;
Mechanical damage, in particular, strikes that lead to the disheve of the display loop or its breakdown;
Manufacturing defects;
Software errors;
No charge.

The last 2 points of the represented list are solved on their own, but in the first 3 cases will take the analysis of the smartphone, its repair or replacement of the display.

Forecast screen on iPhone 8: What to do?

Software malfunctions are eliminated simply and easily at home. All other problems require access to the service center, or independently parsing the device.

System failures

During the operation of the device, the IOS system can be hung, leading to the malfunctions in the work of the smartphone. No screen illumination is one of the similar glitches. You can try to resort to the actions below.

Press the power button.
Simultaneously pinch the volume and side keys to try to lower it.
Wait for the appearance of the Apple logo.
To observe the work of the smartphone after a similar reboot (if it took place). In the event of a resumption, the problem will need a deeper diagnosis of malfunctions.

We make flashing through iTunes

Original Apple equipment is equipped with special dFU modewhich makes it possible to reflash OS or return to its previous version. To roll back the IOS version, which stood before, do the following manipulations:

Open the latter version of iTunes. On your PC or laptop.
Connect the USB cable.
Hold the "Home" button for a few seconds until the iTunes label appears on the screen.
Follow the application commands.

Charge the battery

The reason that the screen is extinguished on the iPhone 8, there may be a banal shortage of charge. Insert the charger into the connector and make sure the charging is performed (this is evidenced by the display of the charging battery on the screen). Turn on your smartphone.

The situation when charging is not displayed, indicates a broken charger. Replace it with a new one and try not to acquire cheap chinese fakewhich, as a rule, quickly fails.

Moisture hit

As if the manufacturer did not assure that the smartphone was waterproof, all the same moisture in it can penetrate. Liquid contact leads to oxidation of contacts. In this case, the image on the iPhone 8 may abide.

We do the following:

We rocate the phone into a dry towel after swimming.
Throw cold air from the hair dryer.
We disassemble the smartphone using special tools.
Watch out motherboard. You can detect oxidation traces.
We clean their isopropyl alcohol using cotton sticks or a brush with a soft pile.

After cleaning and reverse assembly, turn on the phone and check its performance.

As you can see, you can eliminate a malfunction in several ways: fix system errors, repair or replace the part. You need to start work with the elimination of system errors, and then, if the situation is not resolved, proceed to radical actions - repair or replacing parts yourself, or by contacting the service center.