Water damage no restore error 1600/1601/1602

Hi,

I have several iPhone and iPad which have a similar problem often. They have almost all experienced a different accident:

- Flood damage

- Big crash

- Error recovery

All these devices will not start and shows no signs of life.

I can put in DFU mode and try a restore, when prepare the iPhone / iPad for the restoration, the device disconnects and then nothing. iTunes seems to find the device but can not find it. After waiting a few minutes, iTunes gives me the error 1600/1601/1602.

I think it's a motherboard problem. There is a concern of auto-boot, as I am obliged to put into DFU mode so that the device responds a little.

I already exchanged the motherboard to test the components that work properly and still the same problem.

Do you have any solutions or tips for me?

(sorry for my bad english)