This is a very difficult repair. You need to replace the right joystick, there are soldered onto the main motherboard. The replacement parts are cheap, but removing it without damaging the motherboard is very difficult.
Hey from the Home menu, you should go to the controllers section and change grip of the joycon's. From there you can change the joycon's to single mode and make them 2 different controllers.
Hey best thing would be to take the controller apart, there is a model number on the battery itself. That way you can order the exact part that you may need.
Your laptop will never be the same after replacement. Pay the money to apple $440.00 + TX, if you really love your laptop. OR, sell this one for parts, Logic board will get you good money and buy a new one.
There is something stuck inside the slot. Get a flashlight and a pair of small tweezers. There is a small door that closes when there is no game inside the slot. Push that door open and look inside with a flash light and see if there is something stuck inside. If there is pluck it out with the tweezers.
The ribbon connectors are very sensitive on the DSi's. You have to make sure they are connected snug and close the clip. Also, make sure the ribbon is not pinching somewhere.
Hey Luke, I just fixed one this week. You have to take it apart and reflow the ribbon that creates the picture on that side. It is very simple, make sure and not use too much heat. There is a good video on a tear down and reflow of the ribbons. http://www.youtube.com/watch?v=AFQAsEqwh... In the video the guys uses an oven to reflow, but I used a heat gun instead.