v640 light problem
 

I have 2 pieces,water damaged.They where water damaged around charger connector and keypad connector.Nowhere else. When I turn on the phone and logo appears it has light and when logo desappear lights goes off. Then I put phone at rest for 20 seconds and press some key and lights goes on for few seconds and then again off.What can be the problem. i allready flash by settol bt not solved.plz help me thanks in advaneced.