Welcome to the forums Ernesto.
Do you mean "BGA" (ball grid array) components? If yes, then you are probably experiencing the frustration that many technicians have regarding the testing of these ICs. Unless the PCB designers have included test pads on the opposite side of the board, access to the BGA pins has to be accomplished by testing NETS on components that connect to the BGAs or by testing connected VIAs. Having CAD data or schematics can be useful in determining where to test on the PCB. If no schematics are available then testing most (or all) of the components surrounding the BGA devices will work fairly well.
What type of Tracker do you have?
Thanks.
Curtis
(Admin)