Thanks for your fast reply. I think I have found out what caused this catastrophy. Statical electricity. Just some hours ago, I returned one of the boards to my vendor. He gave me a replacement board and all went fine. I was sitting on my chair, stood up to mount it into my simulator and touched one of the control leads. A sparke jumped over and now this board is dead too
. So I now understood why all happened. I am very sad. The only possibility left is to replace the components on the boards.
My boards are all 3051. Does this change the components you mentioned.
Thanks and regards,