Screen gets dark and flickers

I had the back of my tablet off doing some repairs and after replacing the back the screen would occassionally go dark with flickering lines across it every time the Micro Usb was used. But the problem now is that the screen will work perfectly ONLY when the back is off. The instant the back is put back on the screen goes right back to being dark with the flickering lines. I am completely stumped as to why this is happening. Any ideas as to why it works without the cover but not while its on. Obviously i can not leave the back off all the time.

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