Power Button, Volume Button and Silent Buttons won't work
My step-sisters iPhone 5C found its way into a puddle of water and was found the next morning after being submerged all night. They placed it in rice and were able to get it running again. After about half a year she started to complain about the power button on top not working. They took it to the nearby Apple store and wouldn't work on it stating that the cable for the power cable was corroded. Knowing that I purchased a replacement cable from this site and took it apart following iFixit's awesome walk-through. After the replacement was done everything tested out correctly and there were no problems whatsoever. All the buttons worked as they should. Then a couple hours later suddenly and without warning the power button, volume buttons and the silent button all stopped working. The home button still works as well as the screen and everything else. Any ideas?
3 
You need to clean the corrosion and water damage on the logic board, ribbon connectors and the components themselves (Usually done with Isopropyl Alcohol). Replacing just the part only is a bad idea as the phone might just suddenly not work one day or more issues may arise.
由 Ben 完成的
While it had been in water the only part that had corrosion was just the vibrate motor and I was able to completely clean that off. I forgot to add that to my original post.
由 Mitch Gisborne 完成的