When you carry out a screen repair on the iPhone 5S, there is a shield which need to be removed, this shield covers the LCD cable, Proximity sensor cable and the touch screen digitiser cable. This shield is fixed to the board of the 5S to stop the cables being dislodged easily by a drop, this was a common issue in older iPhone models and this is the reason the shield has been put in place. Now you can see from the image above that these screws are all individual and should be put back in the same slot they came out of. if you check out the link again you will see a better images and you can see the difference in the screws , the main difference and concern being the size!
The Fault
Ok, so when you remove this shield , we have realised that the screws need to be placed back in the same place that they came out from. Failure to do so will result in fault Below is an image of the offending screw that causes this issue
The picture above you can see the red circle around one of the screws that holds the shield in place that needs removed to carry out an iPhone 5S screen repair, if you put the wrong screw in this slot then your iPhone will be faulty the screw that holds this shield in place is a different size, and when fitted in wrong place the result is fault in the next image you will see what happens when the wrong screw is placed in the wrong slot
The Cause Of Fault
The next image will show a close up image of this screw mount that has been subject to the wrong screw being fitted in its slot , it looks quite messy, the reason this is ! the screw was to long and has actually screwed right into the logic board and destroyed the layers of the logic board, (did you know that the iPhone 5S has 10 layers on the logic board)
The Next image will show the damage that has been caused clearer, what we have done here is scraped down into the layers of the logic board to find the damaged layers and tracks so we can repair them
As you can see there is 7 tracks here, 6 of them have been damaged by the wrong screw being fitted into the wrong slot and this is what causes the the problem