You shouldn't take apart your DS if you aren't sure about what you are going to do, you'll be better off sending it for repair or selling it and buying a new one.
If you still want to, you will need:
* a three-pointed 'tri-wing' screwdriver * a small four-pointed 'jewler's philips' screwdriver. * a soldering iron if you are replacing the top screen
You can find detailed guides around the web, the best one is: http://www.instructables.com/id/Repairing-a-Nintendo-DS-Lite/
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Nintendo invented the Nintendo DS and the Nintendo DS lite.
The code name for a Nintendo Ds, is Ds
All Nintendo DS are region-free, there is no regional lockout. Any Nintendo DS game will work with any Nintendo DS, and any Nintendo DS game is compatible for multiplayer with another Nintendo DS game, of a different country of origin. I DON'T KNOW!!!!!!!
Nintendo - Dual Screen
Yes. It functions the same way as the original Nintendo DS.