After power button directly into standby

Hi,

My screen got broken, so i replaced my LCD and the glass. Thanks to Youtube this was easy.
The L90 boots fine, my homescreen is on screen and after that it goes in standby mode. So far, so good.

When i press the powerbutton my homescreen appears for about 1 second and goes directly into standby mode again. I dont have any time to unlock the screen.

What could be the problem here?

Question 2: how can i access my data which is stored in my phone, if i cannot unlock phone?

MANY THANKS!

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Does somebody has any idea?
Thanks

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Cheers

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