Android won't turn on at all

Basically the phone won't turn on at all, not normal boot, not recovery mode, not even the battery percentage show up while charging (just the battery icon with lightning, that's it). it stucks on one screen (battery icon/logo) and stucks there until it ran out of battery again. But strangely, download mode is accessible, and when i tried to boot from that, the screen is stuck at the logo my phone is Samsung Galaxy Tab S2 8.0 Inch Help