Samsung S4 screen replacement, Screen goes black

Hello,

I am trying to replace the screen on my samsung galaxy S4 and everthing so fare has gone with out a problem. I have put the prints on the new screen and connected all cables so fare so good it also boots up fine, but here comes the problem. if I put back on the back frame (the pieces where power button and the button with volume op and down) the screen turns black like the phone goes in to sleep mode. But I cannot wake it again with either the the power- or home button. if I take of the back frame agaiin I can turn on the phone and it works like a charm. If I then apply a slight pressur on the cable connected it goes black and I have to take off the battery and set it back on and the phone works just fine again. could it be a defektiv screen?

Sorry for my bad english. I hope you undsand what I mean.

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