Latitude D430Dimension 9150Dell 1815dn Printer
maybe we're looking at the same problem. is this what you have: http://www.sibenaler.com/inspiron_nvidia6800/
i'm having a really hard time with dells techsupport. 2 screen exchanges and now they claim that the screen works as it should. nevertheless, external screens are displaying the brightness/contrast correctly (as well as svhs-out) while the laptop-screen is unbearably distorted.