Weird screen, not broken (i think) help

My sm-t235y was working fine, plug charger 10 minutes... unplug it... and when i use it screen went all vertical lines moving like water.... check picture and video please... what do you think? screen was not hit in any way...

https://youtu.be/kNbbJz2EtJU

what do you think?

thanx in advance

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