No problem thank you !

Is this one right?
If the 5V (mipo's fix) joint is broken, do the 5V testpoint receive the charge? Because I'm starting to think that the problem is there.

EDIT: Answered by myself by using a tester on a broken N900. Indeed the 5V mipo's is connected to the 5V testpoint. So hopefully if I solder using the "russian" fix direcly on the right of that 5V mipo's point I finally get my damned 5V. Am I right?

EDIT2: In the N900 that i'm trying to repair the 5V Testpoint makes no noise with the tester when I touch the 5V mipo's point..but I can't see any damage in the path from the two points..

EDIT3: Solveeeed!!!!! I'ìve made a union with a cable between the testpoint and the 5V Mipo's point and now is charging!!! Thanks a lot for your help Estel I owe you a beeeeer!