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We recommend that you perform the following steps to troubleshoot and handle the problem:
1.Please press and hold the power button and the down volume button at the same time for more than 7 seconds to restart the device;
2.If the problem persists after restarting the machine, it is recommended that you bring the purchase receipt, repair card, and machine to the Samsung service center for inspection.
Note: If the machine can be turned on normally after following step 1, it is recommended that you optimize your phone as follows:
1.Settings - About Phone - System Update - Update, check if there is a system update push, upgrade the phone to the latest version.
2.If the phone supports smart manager or memory manager, it is recommended to close the applications that do not need to run automatically (it is recommended to set the automatic start of instant messaging apps such as WeChat and QQ to "on").
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You can do the following: 1. Take out the SIM card and SD card at the same time, and then try to turn it on. 2. When you see the "Samsung" logo icon when you reboot, press and hold the [Volume Down Button] until the word "Safe Mode" appears in the lower left corner of the screen, and then let go to back up your data (for example:
Contacts, text messages, **, etc.), factory reset. 3. If you can't enter the safe mode or the problem persists after operation, you should bring the three-pack certificate of the mobile phone and send the mobile phone to the nearest Samsung service center for testing and maintenance.
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Replace a phone battery of the same model for testing or take the battery to your nearest service center for testing (for models that do not have a built-in battery).
Charge with a cable for a while and try to turn it on.
Take out the SIM card and SD card at the same time, and then press the power button for more than 10 seconds to test whether it can be turned on.
If it still doesn't work, it is recommended to send the mobile phone to a professional mobile phone store for inspection and repair.
Common problems and solutions for smartphones:
1. The mobile phone does not turn on: After the mobile phone is placed for a period of time, it suddenly does not turn on. Charge for 10 minutes and then check if it can be turned on.
The all-in-one battery can try to press the power button for 10 seconds, force the power to turn off and charge for a period of time, and then try to turn on again; Some mobile phone batteries need to be charged for a period of time after over-discharge, and the mobile phone can only be turned on when the battery voltage reaches the starting voltage of the mobile phone.
2. Touch screen failure: When charging, when the phone is placed flat on the desktop, or after suddenly taking it out of the pocket, the screen fails and cannot be operated. There may be static electricity on the surface of the screen, and when you press the power button to turn off the screen and then light the screen, the control may be normal.
3. Black screen during call: After the screen goes black during a call, the screen can no longer be lit. Some mobile phones have a proximity light sensing function, and when the phone is close to the face after the phone is connected, the phone will automatically turn off the screen (saving power and reducing radiation), but sometimes the screen can no longer be lit after the screen is black; In this case, it is necessary to check whether the surface of the sensor sensor is clean, and in addition, a protective film with poor light transmission may cause the problem of false judgment of the proximity light sensor.
The proximity light sensor is generally located near the handset of the mobile phone).
Commonly used commands for Star phones: Samsung Walkie Talkie Lock: *2767*2878 List of available commands (i.e. help, you can see most of the following commands), * or* or * * Displays all the information of the battery, including electricity.
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