Hi!
Im new here (though ive visited this site numerous times over the past years). I just made this account because I just got my AVS in the mail. I tested it out to find that any NES games that look like the picture below would not work (just a black screen).
The two games that I tested that had short pins were Jaws and Tetris. So, I took the system apart and found that both games worked fine with the top shell off. The problem was that there is a raised plastic edge on the inside of the top shell near the pin connector that was preventing the games from being fully inserted, thus not making proper contact. I resolved this issue by simply breaking off and sanding down the raised parts, which were actually not even necessary for the structural integrity of the system. Here's a picture of the inside of the top shell after I removed the parts.
Put it back together, now all the games work, every time!