Screen that goes off during a call

[DorianneJ]

Translation via Google translate:
Good evening, good morning,
 
When I make a phone call, my screen becomes black and impossible to turn it back on, I am forced to cut the call by removing my sims card so that my screen will re-light it.
I have this worry since today, before that did not do it to me.
 
Would anyone have to where this problem comes from and how to fix it? My Xperia is nine months old.

Bonsoir/Bonjour,

Voilà, lorsque j'effectue un appel téléphonique, mon écran deviens noir et impossible de le rallumé, je suis obliger de couper l'appel en enlevant ma carte sims pour que mon écran veuille bien ce rallumé.

J'ai ce souci depuis aujourd'hui, avant ça ne me le fesait pas.

Quelqu'un serait-il d'ou ce problème vient et comment le règler ? mon xpéria est neuf d'un mois. 

[Qatrium]

@DorianneJ

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.

This might be either a software related issue, or a problem with your proximity sensor:

- Start troubleshooting by restarting your phone into safe mode, this will disable all installed 3rd party apps. If the problem is resolved then one of your installed apps is causing this issue and you have to figure out which one. Start by uninstalling those apps you installed recently.

- If you have installed a screen protector, make sure it's not covering any part of your proximity sensor, indicated by #6 in this photo:

6. Proximity sensor

- Also make sure that the same sensor does not have dirt, fingerprints, or anything else blocking it.

- Go to Settings -> About phone -> Diagnostics -> Test -> Proximity sensor. Did it pass or fail?