Finally i resolder all the connections of the Keyboard <> mainboard and the 10pin chip.
I counted +5V on 10pin chip and the microcontroller (all on the keyboard unit) with polymeter and the connections seems to be ok.
I clean with contact cleaner the main board of the ATARI. (Wrong move). I waited to dry out, even I dried it with hairdryer and Now the situation is worst.
When boot up without a floppy disk, is loading quickly (dont wait 45'') the desktop has no floppy disk icon , no recycle bin icon , and the cursor not moving with the mouse or with the keyboard (alt+arrows).
I am very disappointing.
Anyway thank you for the replays exxos. Maybe i will send you the Unit and pay you for the job. I am no kidding.