Why does Samsung a7000 get a black screen when making a phone call?

It is recommended to try the following:

1. Confirm whether the distance sensor above the screen is blocked or there is dust and foreign matter.

2. Check whether the third-party software (such as mobile phone housekeeper and other management software) is installed in the mobile phone, and please delete such software.

3. Back up mobile phone data (phone book, text messages, pictures, etc. ) and restore the phone to the factory settings.

If the above methods still can't solve the problem, please send the machine to the service center, and the engineer will check and deal with the machine.