What is the reason why Huawei Honor 9 won t turn on? 10

What should I do if my phone doesn't turn on.

I believe that most people have encountered the situation that the mobile phone cannot be turned on, and there may be different reasons for smart phones and non-smart phones, but in general, there are mainly the following situations, and there is no need to worry when the mobile phone cannot be turned on.

What should I do if my phone doesn't turn on.

1. The boot cord is not normal and the boot is not turned on.

Under normal circumstances, when pressing the power button, the trigger terminal voltage of the power button should change significantly, if there is no change, it is generally due to poor contact of the power button or the power line is broken, the component is soldered, and damaged. When repairing, use an external power supply to supply power, observe the change of the ammeter, if the ammeter does not respond, it is generally a disconnection of the power line or a bad power button.

2. The battery power supply circuit is not turned on due to poor operation.

For most mobile phones, after the mobile phone is added to the battery or external power supply, the power supply voltage is directly added to the power supply worker C, if the power supply voltage is not added to the power supply IC, the mobile phone cannot be turned on. For Motorola series mobile phones (except Motorola T2688), the power supply is different, and the battery power supply and external power supply must be converted by electronic switch and then added to the power supply IC. In other words, there are two paths to the power supply of the mobile phone, one is battery power; The other is powered by an external interface (when powered by a charging dock).

When two power supplies are supplied at the same time, the external interface is given priority. The switching of these two power supplies is controlled by the electronic switch tube, which mainly protects the current of the whole machine and prevents damage to the integrated circuit inside the mobile phone due to short circuit or leakage. However, if the electronic switch is damaged, the source module may not get the power supply voltage of the battery, causing the mobile phone not to turn on.

For this kind of mobile phone powered by electronic switches, it can be powered by an external power supply interface, or it can be powered by an external power supply through the battery contacts. During maintenance, the power supply can be provided by different power supply methods in order to distinguish the fault range and determine whether the electronic switch is normal. Generally speaking, if the power supply circuit is bad, pressing the power button ammeter will not respond, which is very similar to the bad power line.

1. Just press and hold the power button when the phone is turned on, and release the power button when the phone vibrates. The possible reasons why the mobile phone cannot be turned on are: a The power button is damaged (pressing the power button does not respond); b. The battery is dead or low on power; c. The mobile phone system is damaged; d. Mobile phone hardware issues.

2. Press the power button + volume plus key to enter the operation of the Shuangqing interface (factory interface). According to the description, it is recommended to wait for a full charge to try again, if it still doesn't work, try the line brushing machine, otherwise it can only be sent for repair.

In the volume, I rush on the electricity, and there will be a vibration, but in.

The phone has been turned on, but it can't be turned on, there are three ways: 1. Press and hold the power button (some machines need to press and hold the power button and the down volume button at the same time for more than 7 seconds) to restart the machine.

2. Connect the charger to see if there is a charging display, if there is a display, charge it and try to restart it.

3. If the hardware of the mobile phone fails, go to the corresponding after-sales point for repair.