Common faults and troubleshooting of Xiaomi mobile phone

Troubleshooting of common faults in mobile phones

Precautions for troubleshooting:

1, which needs to be checked in sequence.

2. It is recommended to go to the after-sales outlets or check before brushing.

(Add and update at any time)

First, the phone restarts.

1 Users are advised to turn off the battery and try again after charging for three hours, or judge by replacing the battery (official battery);

2. It is recommended that users try without inserting SIM card and SD card, because SIM card and SD card may cause the phone to restart;

3. Need to check whether it is caused by a software problem. It is recommended to back up the mobile phone data and restore the factory settings. Do not restore the backup data to test whether the restart failure occurs again;

4. back up the data, and then use MiFlash to brush the machine. Do not restore the backup data temporarily after the successful brushing, and test whether the restart fault occurs again.

Second, the phone can't be turned on:

1. Did the battery automatically turn off before? When the battery power is too low, it will automatically shut down and the battery will enter a dormant state. You need to connect a charger to charge for more than half an hour before you can turn it on.

2. Whether it is 2. You can enter recovery mode. If possible, enter and guide users to enter system 1 or system 2. Any system can enter and download the complete package for upgrade.

If not, guide the user to clear all data of the mobile phone, and then try to enter the system 1 or system 2 again. (Be sure to ask if there is a backup before clearing the data)

3. whether it is 3. FASTBOOT can enter. If possible, instruct users to use the sixth brush tutorial of Miflash. (Be sure to ask if there is a backup before clearing the data)

Final solution

If all the above methods fail, guide the user to follow the after-sales process.

Third, the brush machine failed to start.

1. If you can only enter the recovery, it is recommended to try to update the complete package during the recovery (open USB transmission mode during the recovery, connect the computer with data cable, rename the downloaded complete package, and move it to the SD card for brushing).

2. If you can only enter fastboot, it is recommended to brush miui rom once.

3. If recovery and quick start cannot be accessed, users are advised to check or go through the after-sales process.

Fourth, the mobile phone cannot be charged normally.

1. It is recommended to replace the battery.

2. It is recommended to replace the data cable to connect the computer.

3. It is recommended to use the seat to charge as much as possible.

4. It is suggested to change the charging environment.

Five, unable to connect to the USB disposal method

1. Please make sure to turn on the "USB storage" switch in the notification bar.

2. Ask the user to confirm whether the default connection type has been changed (version 2.3.5 of the system is selected in System Settings-Connect to PC). Select V4 version in all settings-storage)

3. Ask the user to try to replace the USB interface.

4. Ask the user to try to replace the MicroUSB cable.

5. Is the Xiaomi mobile phone driver installed?

6. Uninstall the drive and reinstall it

Six, SD card intermittent identification, frequent unloading

1, enter the hardware check to check whether the SD card is normal, and see if it can be installed and uninstalled normally.

2. Format the SD card after backup

3. Try to replace the SD card.

4. Try to read the SD card by changing computers.

5. Brush the phone with MIFLASH, and brush the phone after backup to eliminate software problems.

Seven, when using the mobile phone, frequently prompt that the SD card has been taken out and is being installed. Accompanying restart

1. Is it an original SD card? If not, it is recommended to format the SD card after backup, format it into FAT32 format with a computer, and then reuse it. If it is still recommended to buy the original SD card;

If it is an original SD card, it is recommended to format the SD card after backup and use a computer to format it into FAT32 format. You can also try to change more SD cards and try to change the original SD card.

2. Back up and clear all the data of the mobile phone, download the complete software package to upgrade the mobile phone system to the latest version, without restoring the data.

Eight, the cell phone signal is not good.

1. Choose a reasonable network type setting according to the user's operator.

2. Determine whether it is the operator's signal (try to change a SIM card on the same network).

3. Upgrade to the latest version of MIUIV4 to enhance the signal.

Please go to the maintenance point for testing.

Nine, no signal/display no service processing method

1.SIM card is inserted correctly.

2. Whether the SIM card is inserted incorrectly, such as the standard version of the telecom SIM card, such as the telecom contract machine with the mobile card.

3. Guide the user into the hardware test to see if the SIM card works normally. If the SIM status is unknown, users are advised to try to change the card in the operator's business hall.

4. Whether the network type is correct and whether the operator chooses automatic. (Unicom preferred 3G, mobile preferred 2G, and telecom preferred automatic)

5. Whether there is no signal in this area. You need to check whether other mobile phones on the same network have a signal.

6. After the backup, upgrade the line brush to the latest MIUI v4 version and try again.

7. Check at the maintenance point.

Ten, when surfing the Internet, 2G has a signal, and 3G has no signal.

1. Ask the user whether it is a Unicom card or a telecom card, and whether the 3G service is enabled. (Be sure to ask)

2. If it is a Unicom card and 3G service is enabled, then: (Target) The disposal method of 3G signal and 3G no signal when surfing the Internet.

3. Ask the user whether there is 3G network coverage in the local area. (Just look at whether other telecom 3G mobile phones have 3G signals.)

4. Re-select the operator and try to select it automatically (2.3 in System Settings-System-Operator, 4.0 in System Settings-All Settings-Mobile Network).

5. If the above methods can't be solved, users are advised to back up and brush to the latest MIUIv4 and try again.

6, still can't solve the problem, suggest the user to the maintenance point for testing.

Eleven, mobile phone fever

1. When running large-scale games and watching videos, the CPU/GPU will get hot due to frequent operation; When charging, the whole charging module will also generate a lot of heat, which is concentrated near the camera on the upper part of the mobile phone. It is normal that all mobile phones will have a slight fever.

Under normal circumstances, the surface temperature will not exceed 50 degrees. (The battery temperature can be found in * # * # 4636 # * #- battery information. )

3. Xiaomi mobile phone has graphite heat dissipation function, and the adopted graphite heat dissipation film can effectively solve the heating problem caused by high-performance dual-core processor. It is a design with fast heat dissipation, not without heat.

12. Mobile phones consume more power.

1. The power consumption of mobile phones has a great relationship with personal usage habits. Generally speaking, the normal time for mobile phones to make calls and stand by is about one and a half days. (If a user reports that the battery is charged once a day, ask the user how long it will take from 100% until the mobile phone prompts that it needs to be charged. The battery charge is only a display, which cannot accurately represent the battery charge)

2. It is recommended to turn on the power monitoring. Under normal circumstances, the screen, Android system, mobile phone standby, Android OS and so on are all relatively power-consuming. (Big-screen Android phones are basically like this)

If the user agrees, you can suggest the user to start the night flight mode. Under normal circumstances, standby power consumption is about 10% for one night, and only about 2% in flight mode.

4. Whether the charging time is normal. It usually takes about 3 hours for the charger to charge from the time when the mobile phone prompts to charge (the LED light flashes) to the time when the mobile phone is fully charged.

5. Because the Android phone program will automatically start running in the background, users can be advised to clear all the data of the phone after backup, so they can use it without restoring the backup. How long does it take from 100% to prompt for charging? A day and a half is normal.

Final solution:

If the user does not approve or can't solve it, you can go to the authorized outlet of Xiaomi House for testing.

XIII. Bad screen:

1. Enter * # * # 64663 # * * in the dial-up interface to enter the screen display test in hardware inspection. If there is any abnormality, it is recommended to go to the user area for after-sales inspection.

2. If it is normal, the customer is advised to brush the machine.

14. The mobile phone is on the screen. Is it out of order?

1. Ask the user whether the screen appears after running a game, playing a video or using a camera. At present, it may be a bug in the process of game production or localization or a problem with the system itself, and the system problem will be corrected in the future.

2. If the screen appears during normal operation or standby, it is suggested that the user switch the screen or restart the mobile phone to try to solve it.

3. Enter the recovery and try to check whether the phone has a screen. If not, please enter the quick start mode and check whether it has a screen.

4, MIFLASH brush machine, if invalid, guide users to apply for after-sales service.

5、

Fifteen, the screen does not rotate, insensitive, and the solution to the inaccurate body feeling in the game.

1. If the user complains that the gravity sensing is inaccurate, directly guide the user to calibrate: http:/10.237.40.29/? p=9 10

2. If the user complains that the screen is not rotating normally, it is necessary to first confirm whether the "Auto-rotating Screen" is turned on in the display settings set by the system, and then confirm whether the software used by the user can be displayed horizontally. It is suggested to use "short message" to test.

3. If the rotating screen is abnormal after confirming the above two points, you can guide the user to calibrate: http:/10.237.40.29/? p=9 10

Final solution:

If the value is still inaccurate after calibration, please try it once with MIFLASH to see if it will be normal. If it still appears after accurate calibration, it may be that the sensor is out of order and maintenance is recommended.