Instructions
Reference the Nintendo DSi camera troubleshooting page before you initiate a repair. The issue you are experiencing could be there with information on how to resolve it.
Locate your Nintendo DSi serial number. It is on the bottom of your DSi. You can also find it underneath the battery. It begins with TW or WW.
Enter your serial number on the Nintendo DSi online repair site and click "Get My Repair Options." This will give you the options to get your DSi repaired including sending it in to a service. Only by entering your serial number and having Nintendo verify it will the site give you appropriate options.