I've ordered a new chip at jan's and it will come soon.
Now I'm afraid i will fry it again if I go on testing it blindly without any advice from you.
As said somewhere in the forum, I will get some small current / slow fuse to limit the current while testing. Try to get also some isopropyl 99% to clean the pcb (I only cleaned it with tooth brush before).
I uploaded some pics, if you can have a look and tell me if anything seems suspicious. The chip is not on the slot anymore, as it is fried.
you can see them here :
I beg for your help ! Many thanks.
Hard is the road, long is the way, but I won't give up...