Hi attila, thanks again for your feedback. I've run a couple of tests and and got something better. I tried the AD2 with a 5V aux and both scope channels work, however I had to turn the power off quickly because the IC shown in the picture gets extremely hot. It seems to the ADA4051-2, right?   I cannot buy one of this in Brazil and have to order from some place in USA. Do you think this should solve the problem? Is there any other component that could have been damaged? Than