Black screen lg stylo 2

I just replaced the SMS micro USB port and everything went smoothly considering this was the first port I attempted to repair. After I finished I turned on the phone and everything worked. Then I took the back cover off and screwed everything back together and when I turned on the phone again I got a black screen. You can tell the screen is getting power its a lighted black color. I took it apart and cleaned all the terminals and still nothing. Can anyone help?

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