water damage, turn on sometime then off?

yoel santos, I suggest that you no longer try to turn it on or try to charge it. Disassemble it using this guide and properly clean it. Use this guide to clean it. It was written for a 3G but all the points are still valid for your phone as well. Always check your board for any missing, burned or otherwise damaged looking components. After that replace the battery, reassemble your phone and re-evaluate for any problems. Make sure that you have a new battery for sure and that it is connected properly. To get the WiFi working again, may require a reflow of the IC. Hope this helps, good luck.