iPhone 5c screen replacement then shows black with backlight?

My mate attempted to fix this phone so I don't know the history of previous repairs.

The screen lights up black, with the backlight showing but I can't see anything on the screen. I even tested with a brand new screen to the same effect.

Could've my friend damaged some connectors on the logic board possibly?

Update: There's something that looks damaged there (down and right a little from the camera connector)..

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zoomed in...

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