From GameBrew - a wiki dedicated to Video Game Homebrew.
|DS Pixel Fix|
Test and fix stuck pixel on DS.
Leave the DS open and charging while you are doing this (may take a while). Please avoid staring at the screen and keep minors away from the DS while fixing is in progress, as the flashing colors may cause discomfort and trigger epilepsy attacks.
Stylus - Move the pixel fixer the lower
D-Pad - Move around the screen fixer upper
A - Start application
Tested on Original R4DS (unofficial firmware 1.19).