The first part of the article summarizes the possible software and hardware causes of the breakdown. The second part of the article tells more specifically about all the common reasons why the device does not work.
By following the tips and instructions in this article, you can find out why the iPhone 4 does not work and does not turn on. Also, following all the instructions, you can quickly fix the problem.
Causes and solutions
Breakage of products from Apple are extremely rare. Often, such gadgets have a solid case, shock-resistant components and high-quality software.
According to statistics, only 3% of all iPhones are exposed to warranty repair... However, sometimes the gadget and its functions fail due to mechanical (hardware) or software damage.
Software
In some cases, software malfunctions become the cause of hardware breakdowns. For example, as a result of an incorrect update, the memory chip of all personal data or the memory chip of the GSM module often fails. Your phone can be attacked by viruses and other spyware software.
To avoid this situation, follow these steps:
Hardware
Hardware breakdowns of a smartphone in most cases require professional repair. Until the warranty has expired, every gadget owner can get a professional Maintenance and repairs are completely free.
However, when the warranty comes to an end, you need to look for a paid service center... Repair of Apple equipment in service centers is quite expensive. In some cases of hardware malfunction, the user can fix the problem himself by adhering to short instructions... Most often it fails on smartphones motherboard, which connects all the main mechanical components of the apparatus.
Damage to the motherboard will automatically damage the processor and memory modules. Also, the iPhone may not turn on after being exposed to water.
Battery wear is perhaps the most common malfunction in Apple smartphones. The plus is that the user himself can fix the problem by replacing the battery. It should be remembered that you need to buy only original battery models.
Another very common mechanical breakdown is damage to the smartphone screen. It is solved by completely replacing the screen. If the sensor ( incorrect work or absolute failure), a new one must be purchased and installed.
Power controller
The iPhone power controller is a microcircuit that performs an energy-saving function and is fully responsible for charging the device. Very often you can find yourself unable to turn on the gadget, while the power controller is very hot.
To fix the problem, you need to contact the service center, or try to solve the problem yourself (if you have the skills to work with the hardware of smartphones).
First you need to remove back cover device, follow the instructions:
- turn off the phone;
- carefully unscrew the screws at the bottom of the device, as shown in the figure;
- slide the cover up with two fingers.
When the cover is removed, remove the battery connector and re-solder the power controller. In most cases, the problem goes away, the iPhone works again and charges normally.
If this decision did not help and the smartphone continues to heat up very much and does not turn on, I should completely replace the power controller.
Water ingress
The standard and familiar problem of any gadget malfunction is water ingress. After water, the phone does not turn on.
You can fix the problem in the most effective and proven way - by cleaning all components:
- disassemble the device;
- then you need to clean the motherboard. Cleaning is done by hand with a small brush. Special cleaning agents are used to completely remove plaque from water;
- then you need to clean all the parts in an ultrasonic bath;
- we carry out drying;
- repeat manual cleaning again;
- then you should gradually and very carefully restore the soldering of all elements;
- collect all the details of the smartphone;
Only this method will help to save the device from moisture ingress.
On the Internet, you can find other tips on how to dry a damaged device:
Important! Remember, if the problem of water ingress into the device is not resolved in time, the connectors may begin to oxidize and rot. In this case, you need to remove them and replace them with new ones, because it is impossible to restore them.
Voltage drops
What to do in a situation when your iPhone 4 goes out and won't turn on? The cause of such a problem can be constant voltage drops, which lead to the burning of the motherboard and the aging of the battery.
To prevent power surges and start your phone, follow these steps:
- always charge your phone to 100%. Frequent and short-term recharging will quickly destroy the battery;
- use only the original charger. When using a non-original charger, the iPhone can simply burn out;
- if the motherboard is burnt out, you need to replace it with a new one.
Video: Iphone 4 won't turn on
The battery is old
Each battery has its own expiration date. Subject to careful handling, it can last up to 2 years. If your phone is in Lately discharged very quickly, and now it does not turn on even in mains power mode, this is the first sign that the problem lies in the old battery.
The only way to revive the gadget is to change the battery. If, even after replacing the battery, the iPhone 4 does not turn on or discharges quickly, disassemble the phone and look at the board, an important contact may come off or short.
iPhone won't turn on
iPhone may not turn on due to a number of common reasons such as a broken connector charger, due to car charging, after flashing, falling height or replacing the display.
Due to the broken charging connector
If the unit is shut down and does not charge, the power connector may be broken or damaged. The problem is solved by replacing the charging loop. For the iPhone 4 series of smartphones, the charging and microphone connectors are connected, so when replacing the power connector, you must also change the microphone connector.
After car charging
It's important to properly charge your iPhone 4 in your car. One elementary rule should be adhered to: the output voltage should be no more than 2A. Otherwise, the phone will burn out and you need to change the battery or even the power controller. The power circuit may also burn out.
After flashing
In most cases, iPhone 4 stops turning on after updating. The point is that some software updates or flashing the operating system may be incompatible with the hardware of your smartphone.
Due to the flashing of the OS, the system, in many cases, fails and it becomes impossible to turn it on. In this case, you should try again to flash the phone with a different version of the operating system.
After falling from a height
If your iPhone falls from a height onto a hard surface and stops working, it may be because one of the cables has come off.
To fix the problem, follow the instructions below:
After replacing the display
To solve the problem of a non-working iPhone after replacing the display, you should first of all, as in the previous paragraph, check the display cable for incorrect location.
If everything is in order with the loop, install the previous display. The old display may be broken, but if the image appears when you turn it on, then the problem is with the new display. Most likely he is defective.
IPhone 4 does not turn on Apple is on
If an apple is on on iPhone4, but the phone itself does not work, you need to follow these steps:
The article covers all the main causes of the malfunction. iPhone smartphone 4. Follow the instructions provided in order to solve the problem that has arisen. If the solution does not help you, contact a specialized service center for professional help.
Everyone can face a situation where the iPhone charges, but does not turn on. Perhaps the cause of the breakdown is serious, and you will have to repair your smartphone for money. However, in some cases (for example, if the connector is dirty or there is a software failure), you can fix the malfunction at home without having the experience, qualifications and tools. It is worth trying to find the problem yourself and restore the phone to work.
What are the causes of iPhone malfunctions
Many iPhone owners experience difficulties: the gadget charges slowly or does not turn on at all. And if a minor problem (for example, a broken Home button) is not so critical, then in such situations it is impossible to use the phone.
The main causes of the malfunction:
- the most important internal parts are damaged (tristar controller, synchronization loop, power controller, motherboard or battery) due to mechanical impact (shock, falls) or flooding
- a faulty, non-original charger is used (cheap Chinese fake)
- breakage of the Lighting connector or its contamination caused by dust, hair, lint and other small debris
- software failures (software directly affects the microcircuit that controls the charging process)
- the USB port of the tablet or stationary computer is broken
- a factory defect in Apple components involved in the battery charging process
Errors in the operation of programs, breakdown of chargers and iPhone parts (batteries, connectors, cables, etc.) can manifest themselves in different ways. A few examples:
- iPhone won't turn on after being discharged (when the battery is low)
- the application hangs, does not respond to taps, or the screen is completely black
- the gadget turns on, but hangs after the Apple logo appears
- the indicator is on, but the charge level is very low even for a long time
- The iPhone is discharged and does not turn on when charging from a cigarette lighter or computer
Before taking your smartphone to a service center, make sure that the cause of the malfunction is a breakdown in the hardware. And in no case postpone the trip or the call of the master if you spilled water on the iPhone - every hour of delay can aggravate the situation.
How to get your iPhone back on track
If you have problems with switching on and charging, first of all, check if there is current in the outlets. Next, if the phone does not turn on at all, connect it to the charger. In a normal state, the gadget immediately writes that it is charging - the indicator is on, which means the process is in progress. Remember that the battery is not designed to operate in low temperatures. Therefore, warm up the smartphone before connecting the charging, if the battery runs out in cold weather.
Another situation - you are trying to start an iPhone that has been discharged for a long time. If the battery runs out to zero, you need to wait 15-60 minutes and only then press the Home or Power button.
The smartphone still does not respond - we perform a hard reboot:
- press the power and home buttons at the same time (for 7th generation devices - "Power" and the volume button)
- wait 10-20 seconds until the Apple logo appears on the gadget screen
- release the buttons - operating system will start in about one minute
This method also helps with other problems. For example, when the program hangs or there is no reaction to the buttons.
When the Apple logo is on and off again, you need to restore. Most likely, the battery has run out due to a software failure. The error was caused by an unsuccessful iOS update or downloading and installing unlicensed software.
Recovery algorithm:
- run on computer iTunes program and insert the USB cable into the connector
- turn off the smartphone using the combination Home buttons and Power (if you have an iPhone 7, use instead Power button volume)
- press the "Home" button and, while holding it, connect to the computer
- hold Home until the phone screen starts showing the iTunes logo and plug icon
- the computer display should display the message “There is a problem with your iPhone; it needs to be updated or restored "
- confirm recovery
Download and installation procedure new version iOS will take about 30-40 minutes. There is another way to restore - DFU mode... The method is radical, as it destroys all data on the phone. Stages:
- connect the charger (the charge level must be greater than zero)
- after five minutes, disconnect the charger, connect the smartphone to a computer (stationary or tablet) and turn on iTunes
- simultaneously press Home and Power, hold them for exactly ten seconds, then release the on and off button
- keep "Home" (15-30 seconds) until the notification in iTunes (when you enter DFU mode, nothing should be on the phone screen)
Then you should confirm the procedure and click on the "Restore" button. If you forgot to overwrite data from your phone, you can undo the restore: disconnect the USB cable, hold down Home and Power for 10 seconds. Then the iPhone will reboot.
If everything is fine with the software, inspect the connector for contamination. The litter clogged in Lighting should be carefully removed using the available means, for example, a toothpick.
When charging the battery from a computer, consider the functionality of the USB port. You may not have enough current - try a regular Apple charger.
Pay attention to the charger itself. Even if Genuine Apple cables are fragile - sheaths and conductors are easily damaged - what to expect from cheap Chinese products. The phone may stand for a long time and show charging, but it will still be zero if the charger is fake or broken. Use only original charger to avoid such problems.
If the above actions were unsuccessful, most likely the battery discharge was due to normal wear and tear, factory defects or damage. If you dropped or flooded your phone, don't even look at the indicator: take the gadget for repair as soon as possible or call a specialist home.
Separately, it is worth mentioning the case of the clock transfer to January 1, 1970. When someone jokes in this way, the smartphone does not turn on either - it constantly reboots, does not go beyond the logo. In such a situation, you should wait for the battery to run down to 100% - only after a complete discharge can you return to working capacity. In order not to wait too long, you should contact the workshop or do it yourself: disassemble the phone, remove the battery, insert it again and assemble the smartphone. Then the date is reset and it turns on again. Independent actions are possible if you have the skills and professional tools (suction cup, tweezers, spatula).
October 28th, 2014 admin
Don't worry if your iPhone isn't working or responding to buttons when you try to turn it on. There are several methods to get it up and running. We will talk about troubleshooting in our article.
First you need to check the charge level of your phone. Maybe the device is simply discharged. Try to charge your iPhone phone and wait half an hour until the charge level is low. When connected to a charger, the display should show a lightning bolt on the background of an empty battery. 
If the battery is one hundred percent discharged, then by pressing the power button, you can see an image with a lightning bolt and a socket on the display of the device. This means that you still need to charge your phone. 
There are situations when the iphone with a fully charged battery can turn off at one moment and not respond to buttons. This is the power saving mode in iPhone. The phone switched to this mode because you haven't rebooted your device in a very long time. For turn on iphone you can simply hold down the two Power and Home buttons for 10 seconds, after which the Apple logo should appear on the display.
Any mobile device may freeze if terminated incorrectly running application... If such a situation occurs, then we hold down the restart button and wait for the logo to appear.
Hardware tasks mobile device fixes are even more difficult than a frozen program. Open the lid mobile phone and remove the battery. If you see oxidation of contacts, then a trip to a service center is inevitable. There may be water in the phone. It is possible that the battery has deteriorated.
Check your charger, you may visually see mechanical damage. Check the connector of the cable from the charger. If you find any mechanical damage, we advise you to contact the service centers.
If you turned on the phone, there is an apple logo, but then the system does not boot, then most likely you either have a firmware error, or a discrepancy with boot file systems. Try restarting your phone. If the discrepancy is not eliminated, then you need to urgently contact the service center.
If the crystal deteriorates on an iPhone how to turn it on
