iPhone 6 home button problem

Hello

I"ve got à iPhone 6 with home button problem. The original home button was damaged so i changed it for à new one.

But when i turn the phone on with the home button flex cabel not connected there is no problem works fine. When i connect the home button screen fall away and phone fell out.

I cant turn on the phone anymore but when i disconnect te home button flex it turns on normal way

Anyone ideas?