Samsung Galaxy Tab 2 (GT-P7500) won't turn on or charge

Hey there,

I have recieved this tablet a few days a ago, ordered original samsung charger and tried charging it up and turning it on, however the tablet wont turn on (not even a battery icon doesn’t show up). I tried taking it apart, disconnecting the battery for a while connector, holding the power button and volume buttons in various combinations but no luck. I also tried charging it with higher voltage charger (I read somewhere that it might help) but recieved the same result as before.

Asking here is kind of my last resort because I need it fixed asap, any ideas please ?