I'll tell you what I know and I know a very few things about electronics. I bought that Duo in a bundle and I knew it wasn't working, the seller told me. once I got the Duo, i tested it and was really not working
. After, I found in the CGCC forum (Canadian VG collector site) a guy that has a shop and was repairing Duos. I sent him the Duo but he was not able to repair it. After that, one guy on the CCJVQ forum (Quebec VG collector site) wanted to repair it, it's like a challenge for him. That guy is now my friend but i see him rarely, we are not living near each other. Ok, now you know the whole story. But what is the $&%$*?%$ problem with my Duo.
We found that the Duo is working partially, if you use the Hu-Card, sometimes we can ear some sounds but not always. There is no image. First, he changed all the caps but the Duo is still not working. He talked with someone on this site, I think he said it was Blue but maybe I'm wrong. That person pointed him in some direction to find the problem. He's drawing the circuits and test the connection at the same time using the tip he got from that guy. He told me that maybe a cap leaked somewhere and damaged one or more connections. He's working on it part time and I let him play it because he really want to fix it.
Now you know all the story. Maybe my Duo is dead, maybe not. I always dreamed to own a US Duo. I have a Japanese Duo that I bought during a trip in Japan but it's not the US Duo I wanted when I was a kid. I hope I have answered all your questions, please help me found one.