I will stress that if your phone was submerged in salt water make double certain that you do an exceptional job cleaning everything or the phone wont last long at all, here is the part you need, https://www.gounlock.com/details.php?itemId=8158, but it could also be where this part plugs into your motherboard if it's corroded so I would double check and do a good cleaning with alcohol and a toothbrush, use these cleaning methods they are for an Iphone but it shows how to stop corrosion, [guide|5825], here is a teardown guide also for your Gallaxy, good luck. [guide|9391]