Black screen, no LED sign for charging

Hello, since yesterday my FP1 got a black screen. So the phone is working as some people tried t call me and it was ringing. I already took everything apart but it doesnt help at all. The LED is off when I am charging the phone and I cant connect it to my computer. Anyone got an Idea?

A post was merged into an existing topic: FP2 Won’t turn on or charge