Answer to: Is it possible to swap select 3000 components for 2000 components?Some parts yes! (UMD) But screen no :( The flex cables are different sizes. The 2000 board doesnt have a connection for a mic. The only thing you can do is swap the housing. The UMD and front housing can be swapped
Answer to: The top screen of my ds is floppyIt sounds like the hinge is broken or weakened. Also, if the screen is flickering or malfunctioning it is usually cause by a damaged flex cable when the hinge gets broken. There are 2 parts you will need, the top screen, which can be aquired via ebay etc. and you'll also need a replacement housing. If the hinge needs replacing you will actually only need one housing part, the inside topscreen part. The ds requires a triwing screwdriver to open. The step by step replacement guide on here will show you how to do it.