Има голяма вероятност да е от конектора за зареждане.
http://www.ebay.com/itm/Replacement-Charging-Port-Connector-Flex-Cable-For-iPhone-4S-Black-White-HS-/111711724844?var=&hash=item1a0289a52c:m:mk-MTaQRKgdUaz5E7f9wFkQ
http://www.ebay.com/itm/Replacement-Charging-Port-Connector-Flex-Cable-For-iPhone-4S-Black-White-HS-/111711724844?var=&hash=item1a0289a52c:m:mk-MTaQRKgdUaz5E7f9wFkQ