What is the reason why the mobile phone can t be turned on, and it can only be turned on by charging

Reasons and solutions for mobile phone not turning on:

1. The boot line is abnormal: use an external power supply to supply power to the mobile phone, and use the electric link.

If there is no change, it is likely that the boot cord 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 dual total oscilloscopes.

Check the CPU power supply of the mobile phone to check whether the waveform in the reset is correct.

5. Logic circuits.

Problem: That is, the fault of the mobile phone circuit version, 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.

It is recommended that you:1Charge your phone for half an hour, then press and hold the power button to see if it can turn it on2

When the phone is turned off, press and hold the power button and the volume down button at the same time, about ten seconds, enter the recovery interface, use the volume button to select and restart the phone, use the power button to confirm, and restart the phone. 3.If the above operation cannot be turned on, you can go to the local after-sales service for help.

If the phone can't turn on normally, this situation is mostly caused by system failure, and you can re-flash a system to solve it.

Is it because the sequence is faulty?

1. There is no electricity。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 mobile phone battery is sufficient, but it cannot be turned on normally, there may be a problem with the mobile phone software system. At this time, you can try to press the home button and power button on the home screen of your phone at the same time until the screen is lit up and there is a display.

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.

Routine maintenance of mobile phones

Generally, we will have an idea that it is better to charge the battery power of the mobile phone after all the power is discharged, which is basically true, because most of the rechargeable batteries we used in the past are nickel-metal hydride batteries, and nickel-metal hydride batteries have the so-called memory effect, if you do not discharge and recharge, it will lead to a rapid reduction in battery life. That's why we don't use the last drop of power before we start charging.

However, most of the current mobile phones and general IA products use lithium batteries, and lithium batteries do not have the problem of memory effect. If you still wait until all the electricity is used up before charging, it will make the chemicals inside the lithium battery unable to react and reduce the lifespan. The best way to do this is to charge it when it's okay and keep it at its best at all times, so your battery will last a long time.

Causes: Incompatible third-party software, system crash caused by phone rooting, phone hardware damage, etc.

Here's how: Method 1:

Double clear by entering recovery mode.

1.In the power-off state, press and hold the power button and volume + buttons of the phone at the same time.

2.Release the keys when the screen lights up and wait for the recovery mode to enter.

3.Use the Volume+ and Volume—keys to adjust the bright bar to "Wipe Data Factory Reset", i.e. "Clear Data Restore Factory Settings", and press the Power button to confirm.

4.Use the Volume+ and Volume—keys to adjust the light bar to "yes, delete all user data" and press the power button to confirm.

5.Wait for a while until the screen appears, select "Reboot System Now" to restart your phone, and press the power button to confirm.

6.Wait for your phone to reboot into the system.

Method 2: Enter fastboot. Ways to get into fastboot:

In the shutdown state, first press and hold the "home button", then press and hold the "volume down button" and then press and hold the "shutdown button", and then let go when the boot screen appears, you can enter fastboot. Connect your phone to the computer and flash a complete system package. (Please find a professional to flash the machine).

Method 3: If this is still the case, enter the after-sales process and detect the fault of the mobile phone.

It is suggested that you can judge the situation by following the following methods that will help you solve the problem:

1.Please confirm whether the battery is charged, it is likely that the battery is too low to turn on, it is recommended to use the standard charger + data cable to charge for 20-30 minutes before trying to turn on;

2.If it still can't be turned on after charging, it is recommended to plug and unplug the battery several times, and then turn it on to try again. If there are multiple spare batteries, it is recommended to try to replace them and then try to turn them on.

You can also use an eraser or alcohol (industrial use) to clean the battery metal shock and connectors to see if there is any improvement;

3.If it is in a black screen and cannot be turned on: If you plug and unplug the battery (the battery is charged) many times and replace the battery, and the battery cannot be turned on, if it is in the black screen state, it is not excluded that there is an abnormality in the power supply IC and other components, and it is recommended that you go to the local site for specific detection and processing;

If it is the former, you can press and hold the power button (about ten seconds) until it restarts, if it is the latter, you have to wait until it is charged enough to turn on the power, if none of the above then your phone may be a hardware problem and need to be repaired.

First, there is a problem with the display screen, second, the mobile phone is not on the battery, and third, the mobile phone has suspended animation.

The following describes how to troubleshoot if the phone fails to turn on:

1. Check whether the battery is too low.

After charging for 30 minutes with the standard charger and data cable, press the power button to see if there is a charging screen.

No charging screen: Please replace other chargers and data cables that can charge normally to confirm whether the charger and data cable are abnormal. If there is still no charging screen after replacement, it may be a fault of the mobile phone, it is recommended that you bring your mobile phone, charger, data cable, and purchase voucher to the customer service center for testing.

There is a charging screen: Please press and hold the power button to try to turn on, if it can't be turned on, please follow the methods below to continue troubleshooting.

2. Confirm whether the machine is damaged or liquid.

Do not turn on the phone after liquid inflow: If the phone has been automatically turned off, please do not try to turn it on, you can use a paper towel to absorb the liquid, and send the phone to the customer service center for testing as soon as possible.

Do not turn on the phone after the fall: There are unstable factors after the phone is damaged, it is recommended to send the phone to the customer service center for testing.

3. Force restart your phone.

Try force restarting your phone to see if it resumes, and check if the power and volume buttons are stuck in the case.

Force Restart Method:

Models released before September 2017 (models before x20): Press and hold"Power button"More than 12 seconds.

Models released after September 2017 and new models released later (x20 and later): Press and hold at the same time"Power button"+"Volume down key"More than 10 seconds.

NEX 3 NEX 3S: Press and hold the top round button for more than 10 seconds.

4. Repair the system.

Enter"System Repair Mode", and then tap"Install the system software"Enter"Networking updates to the latest version", click"OK"(It is recommended to connect the charger) - Connect to the available wifi, when the upgrade package is detected, tap"** and install"Update your phone's system.

Ways to enter System Repair Mode:

Models released before September 2017 (models before x20): Press Shutdown status"Power button"with"Volume up key"Enter recovery mode;

Models released after September 2017 and new models (X20 and later): Press Shutdown status"Power button"with"Volume up key"Enter fastboot mode, then enter recovery mode through the menu selection, select: install system software, and then select:

Networking updates to the latest version

NEX 3 NEX 3S: Press and hold the top round button for about a second in the shutdown state, then press and hold the volume up button to enter fastboot mode, press the volume down button to move to"Go to Recovery", press the power button to confirm to enter recovery mode.

5. Service center testing.

If the above methods fail to solve the machine problem, please bring your mobile phone and purchase voucher to the vivo customer service center for testing, enter the vivo official website vivo**app--my--service outlets or pay attention to WeChat*** "vivo customer service"-self-service-after-sales outlets, select provinces and cities to inquire about the service center information, it is recommended to contact in advance before going to avoid empty running, plan the itinerary reasonably, and travel safely.

It should also be able to turn on normally when charging, but if the phone is out of power, don't turn it on immediately after plugging in the charger, because the battery power is still very low at this time, and it is still a little difficult to turn it on, and there should be no problem with turning it on again after charging for a period of time.

The reasons why the Apple mobile phone can't be turned on when charging are as follows:

1.It may be due to the battery running out and the device 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.

2.Don't think that when you connect it to the power supply, you can turn on it normally when it is charging. However, if you use up all the battery charge, the charge will need to be charged to 5% before it can turn on properly. So in this case, please let the phone charge for a while before turning it on.

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

4.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.

Here's how to charge the battery on your iPhone:

1.Generally, the battery of a new mobile phone is used for the first three times to the low power alarm (10%-20%), and then with the original direct finger charge to charge the mobile phone until it is full, and then continue to keep charging for about 1 hour.

2.In daily use, the battery is fully charged, to avoid continuing to charge for a long time, the mobile phone power remaining in 20%-30% can be charged, no need to use a low power warning, in case of shutdown, the battery should be charged as soon as possible.

3.Try to avoid charging before going to bed, because the charging time before going to bed is longer, and the voltage is unstable at night, and the night voltage in many places is relatively high and fluctuates greatly, which has a greater impact on the battery.

4.Generally, the battery of a mobile phone can be charged, used and stopped at any time. Cycle life refers to the number of full charge and full discharge, and partial charge and discharge can be understood as a fraction of the life.

The key to battery use, the battery is fully charged, and it can be charged for 20 minutes - half an hour to reach saturation, but be sure to avoid charging for a long time after being fully charged. <>

Hello dear! I'm glad to answer for you, whether the mobile phone charging can not be turned on may be due to the following reasons: 1. First check whether there is a problem with the mobile phone or charger, you can try to replace a charging head for charging, if the screen of the mobile phone appears with the charging sign, it means that it is a problem with the charger, and you only need to replace a new charger.

If there is still no response, you need to take your phone to a repair center for repair. 2. If the power of the mobile phone is too low or not charged to the minimum requirements, it will cause the charging to be unresponsive and unable to turn on, because the mobile phone will automatically shut down if the power is too low when in use, the purpose of this is to protect and prolong the life of the battery, so you can wait for a while more when charging the mobile phone, and then restart it after the battery receives the minimum amount of power. 3. If the power of the mobile phone is in a sufficient state, you can choose to press and hold the power button for 7 to 10 seconds to force restart the phone, and then wait for the screen to light up.

This answer applies to most brand models of mobile phones such as Huawei, Apple, Xiaomi, etc. 1. The boot line is abnormal: use the external power supply to supply power to the mobile phone, and use the telephone meter to detect whether the indication has changed, or the boot button is not in good contact.

2. The power supply circuit of the battery is abnormal. 3. The IC of the mobile phone power supply is not normal. 4. The system clock and reset of the mobile phone are abnormal.

5. There is a problem with the logic circuit. 6. Software conflict: The installed software does not match the system of the mobile phone, and the mobile phone can be connected to the computer to delete the program.