iPhone 4s no charging after water damage

Hi guys,
i have an iphone 4s with water damage. After cleaning all parts the itunes will recover the phone, but the recovery stops with error 2001. On the phone screen the apple logo appears for a short time or sometimes the blue itunes logo appears. After that appears the error 2001. Reboot loop. The battery is not charging.
What can I do ? Should i change the dock connector or is the usb charging chip damaged ?