Chosen Solution
Hi, The issues you are describing are mostly due to A/ poorly seated screen cables or B/ to poorly made or damaged screen cables or C/ to very poor screen quality. It’s usually A and/or B. Therefore a new good quality screen assembly properly seated in place will solve your issue. Be extra careful when connecting the screen cables and when re-installing the shield that holds the cables in place: pulling on the screen and/or the cables can permanently damage the screen assembly and cause the issues you are describing. Sometimes, but less likely, the screen issues you are referring to may be due to logic board damage due to a drop or a pry mistake for example, but you cannot tell for sure until you try on a new known good screen assembly. The missing gold prong will not render the phone useless. And in any case, if you look hard enough on eBay, you should be able to find for ~$10 a set of “small parts for iPhone 5C” that will contain this item.
It’s an RF conductor for upper GPS/cellular antenna. Without this part, you may experience poorer GPS/cellular performance and battery life.
