I have a VT2000 on my A2000. First time I got it, it did not work correctly, i forgot what was the problem, but I do remember what I did. I saw some oxidation on my board, some white stuff all over the board. I cleaned all of it with an alcohol.
I worked after I did that, so try to clean the board and the contacts real good and see if it helps. Take the board apart, so you can clean both sides of all the boards.
