Iphone 6+ After LCD Replace phone will not turn on.

Hi i have a problem. I have replaced screen of my iphone 6+. First time that i have assembled new screen, sensor and anterior camera doesn’t work and i have to reassembly all again. Now phone doesn’t power on, no charge sound, no screen, nothing to all, only black screen. I can to access at DFU MODE but reset doesn’t work(error 4012/4013). I have already put off battery and try to power on for remove all alimentation and too reset with home+power for 10sec but nothing. Please help me.