Ok it works,
I have just pushed up the camera slice out (picture 62, page 20 in Service Manual V1.0)
What I see the camera objective was moving in all directions, I put it back with a small needle or so.
Using FV5 camera app (free) I put back objective in place until no blurry pictures.
Then I made a very thin washer who cover objective to stabilize it between transparent-plastic-glass cover (the term is "slice" in service manual, is this correct ?), and I take the slice back in place.
The result is (for now) very good, and it seems pictures are better because I had