I am currently a student of Electronics Engineering at ITT Technical Institute, and have trained under a repairman with 20 years experience and full certification from Microsoft, Sony, and Apple. I can repair nearly anything with a board in it, from laptops to iPhones and iPads to Playstation 3 and PSP, Xbox 360, and Nintendo DS.
This is an example of the dust and debris that can build up in your systems over time... poor ventilation and circulation coupled with pets, dust and heat can shorten your game's life dramatically. Frequent cleaning can keep you from buying a new $300 machine. Lasers burn out and chips become unsoldered from the board, and then you kiss your gamer score goodbye!
Come to a pro who's trained to deal in teeny tiny parts... I can even completely rebuild your Nintendo DS/DSi/DS Lite or PSP and bring it back from the dead - I have the technology!