From GameBrew - a wiki dedicated to Video Game Homebrew.
DiagnoDS is a NDS console tester.
It is presented to the Scenery Beta 2010.
It reports the functions to be performed and the results of the test on completion. You can use it to check the status of the buttons, audio, microphone, wifi and FAT of Nintendo handheld consoles.
Fix L and R buttons temporarily:
- For this trick you will need to close the console.
- Put your mouth close enough to cover the entire L or R button, blow strongly to ensure that the air enters the console.
- Start DiagnosDS and check if the button would works, if not, put some alcohol around button and try the above steps again.
Select+Start - Exit button tester
Press the appropriate button to perform the corresponding Test.
Tested on EX4i (firmware 1.30).