Problem when i dial numbers

[Tale]

Last few days, when I dial number from my contact list my display turn off, the next call is Ok, and so on. One call is with black display, and very next is regular, with contact picture, number time .

[Samuel1]

And this happen when you're holding the phone in your hand? If you cover the sensor at the top of the screen it should turn off the screen (to prevent you pushing anything with your ear during calls).

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[Tale]

It happens all the time, once is black, and next time is OK, no matter how I hold phone. Where is that sensor,  last saturday I changed speaker at service, so maybe they do something wrong, but problem occures every second time, when I dial number. If it is a mechanical problem,  display will turn off every time.

[Samuel1]

Sounds like something might have gone wrong at the service center. I would recommend to send it back so they can take a look at it.