Thanks Grossel,
You are really kind to spend time to reveal the path, at this point I don't think to be able to go ahead (I'm not an electronic/engineer guy) and don't want waste other people time, I thought that the faulty battery blew the R2 resistor, I didn't find any fuse inside the charger and I thought the R2 was working like a fuse, sounds it's more complicated to me and as you said It might as well be something else that getting Q1 or Q2 to turn hard on
I don't have the skill to test all the other parts to identify the fault, I try to "recycle" stuff before throw away and buy new one, I'm good with mechanic but not with electronic stuff...
Thanks to mr. crutschow too,
I have really appreciated your suggestions guys,
Regards
Tommi