Hello all! I had the chance to get two original Thunder Dragon boards. The first one worked perfect, but I got not sound on the second one. Inspecting the board I just realise that the board without sound doesn't have the Sound processor and 3 74LS245 chips are missing. I could not notice any solder imperfection on the boards, looks like this components never were soldered on it. It is possible that this boards come out of factory without them on some cases? Also, is there a change that just putting them I can have sound working on the second board? Thanks!