Yesterday, my phone got wet from salt water at the beach, obviously when I tried to turn it on, it didn't work. As soon as I got home, my friend took it apart, dried it for me, and cleaned it with 91% alcohol to remove the corrosion or tried his best. He took out the battery and told me that the corrosion had chipped of one of the four golden chips on the battery and I saw it did. He plugged in the iphone with the cable and the screen with the apple logo came on. My question is, does that mean the motherboard is good and all i need is to buy a replacement battery?