Good evening everyone, today the SMPS cards arrived after almost a month of waiting, the post offices here in Italy work badly, well, this evening I replaced them, no shorts on them, I carefully checked all the soldering and I have no found no problem, I connected the QMX to the PC and it is not detected by win 10 whether powered with 7V or with 8, 9 and 12 V at 500 mA. Would anyone have any suggestions for me to do further tests.? Thank you very much 73 IU8EUN