Why does the mobile phone sometimes fail to turn on when it is dropped, and sometimes it can be turn

Since your mobile phone has fallen, it is not easy to turn on when the card is in, sometimes it can't be opened, sometimes it can be opened, then your mobile phone may have vibrated inside, the cable is loose, the contact is not good, or some contacts are not in good contact.

Hello, in fact, our mobile phones are not dropped, so if you fall, he will sometimes not be able to turn on, because of the breakpoint in it, which can not be accessed normally, so we should be careful in the future, don't always drop the phone, which will affect its performance and normal operation.

It is likely that the internal components are not in good contact.

Because of the complex structure of the mobile phone, it is recommended to send it for repair regardless of whether it is under warranty or not.

The information you provide is not comprehensive, and through your description and analysis, it may be that a certain line is not in good contact, sometimes it can be contacted, and sometimes it cannot be reached!

It could be poor internal contact.

If you are using a vivo mobile phone, because the mobile phone is not a drop-resistant product, the components inside the machine are very precise, due to different degrees and angles of bumps and falls, it may lead to inconsistent stress area, and the degree of damage to the machine is also different.

You can bring your mobile phone to the vivo customer service center for testing and processing, which is subject to the service center testing, and it is recommended to contact in advance before going to avoid empty running, plan your itinerary reasonably, and travel safely.

Customer service center address: Enter vivo official website vivo**app--my--outlet query or vivo official website web version--bottom of the bottom -- service support--service outlet inquiry--select the province and city to query the customer service center address.

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, use the telephone meter to detect whether there is a change in the indication, if there is no change, it is likely that the boot line is broken or the boot button is not in good contact.

2. The power supply circuit of the battery is abnormal: use the external wiring of the mobile phone to supply power, 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 if the test value is normal.

4. The system clock and reset of the mobile phone are abnormal: you can use the dual total oscilloscope to detect the CPU power supply of the mobile phone to check whether the waveform in the reset is correct.

5. Problems with logic circuits: that is, faults in the circuit version of mobile phones, 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.

Data Development:

Many users have experienced the condition that the mobile phone will suddenly turn off automatically when the power is sufficient and in standby mode, and the reasons may be as follows:

1. The protection circuit in the lithium battery is overly sensitive, so the current will be cut off as soon as it is large.

2 The battery itself is aged.

3 Water ingress into the mobile phone (some mobile phones do not have waterproof function).

4. There is dirt on the metal sheet in the contact position of the battery, which causes poor contact with the power supply.

5 The joint between the battery and the mobile phone is easy to loosen.

If the first two problems are found after the inspection, then you must go to a repair shop to repair them.

Note on mobile phone use:

1. Avoid touching the metal piece of the SIM card, any scratch or damage will cause the SIM card to be unreadable.

2. Do not put the mobile phone at the air outlet of the air conditioner, because the water vapor condensed in the mobile phone will invisibly corrode the machine board.

3. The charging time should be moderate, generally 8 hours is enough, if it is overcharged, it will shorten the battery life.

The mobile phone is not a drop-resistant product, and the damage caused by different falling heights and landing angles may be different.

If you use a vivo mobile phone, you can bring your mobile phone and purchase voucher to the customer service center for testing and processing, customer service center address: enter the vivo official website vivo**app--my--service outlets after-sales outlets--select provinces and cities to inquire about the address of the customer service center, it is recommended to call the customer service center in advance to confirm the relevant matters and understand the working time, so as not to delay precious time.

Note: The equipment is not covered by the warranty, and it cannot be guaranteed or replaced with a new one.

If you are using a Huawei smartphone, we recommend that you bring your warranty certificate to a nearby Huawei Customer Service Center for repair.

Boarding service. Huawei Customer Service Center.

Repair spare parts** inquiry.

Hello, check whether the appearance is damaged, when the power is sufficient, you can press and hold the "power button" for more than 12 seconds to try; If there is no response, due to the instability of the performance of the mobile phone after the fall, the mobile phone can be sent to the official customer service center for testing and processing. Official website app--service--My service--Service outlets--Select the province or city where you are located to inquire about the address and ** of the nearest customer service. Tips:

In order to save valuable time, please contact the customer service center to confirm the relevant matters before you go.

The phone can't be turned on.

Causes and solutions: bai1, boot line du

Abnormal look: use an external power supply to power the mobile phone, use the electric meter to detect whether there is a change in the indicator, if there is no change, it is likely that the boot wire is broken or the boot button is not in good contact. 2. The power supply circuit of the battery is not normal

Use an external connection to power the mobile phone DAO, see if it returns to normal when it is turned on, and 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 if the test value is normal.

4. The system clock and reset of the mobile phone are abnormal: you can use the dual total oscilloscope to detect the CPU power supply of the mobile phone to check whether the waveform in the reset is correct. 5. There is a problem with the logic circuit

That is, the failure of the mobile phone circuit version, which can generally be solved by repair welding, software conflict: the installed software does not match the system of the mobile phone, and may also cause the situation that the mobile phone cannot be turned on, and the mobile phone can be connected to the computer to delete the program. This question.

If you have the money, you can take it to repair.,If you don't have money, it's nothing.,It must be the key to turn on the machine.,You can turn it on when it's disassembled.,Soon,I'm dismantling it myself.。 If you take it for repair, those repairs will cost 30 yuan when disassembled, you think for yourself.