When I make a call the screen blacks out

[عامر1]

Translation:

When I make a call the screen blacks out

عندما اقوم بااجراء مكالمه تعتم الشاشه نها

[Qatrium]

@عامر1

I used Google Translate to find the meaning of your message. Kindly post your future questions/feedbacks in English so we can assist you, this is an English based forum.

To troubleshoot this issue, you must make sure that nothing is blocking the proximity sensor of your phone. Anything that covers that sensor (screen protector, adhesive film, case, dust, fingerprints, etc) will cause your phone screen to switch off when you make calls.

If you have a Z5, the proximity sensor should be as in diagram (position 4):