HelloI need a quick help phone broken screen when changed and open the back cover Motherboard did not pay attention to the three screws on the cover has been used to open the knife and when working on that removed copper tip of the motherboard and is located next to the entrance to the sound earphones there is a small white box and the bottom of a copper tip This side is moving away from the painting, please look at the picture 1 in step 10 you will see it

please help me !!!