One day, I turned on my DSi and the top screen was faded with what looks like interlacing artifacts always going down the screen. Today, I took it apart, cleaned all of the contacts with 70% isopropyl alcohol and I noticed that the screen works completely fine without the shoulder buttons and SD Card slot (back panel) connected. However, when I plug the back panel back in, the problem appears again. I don't have a lot of knowledge when it comes to electronics so I decided to come here to ask how to fix it. Thanks!