Well, looks like someone figured out the likely cause of the 3000's screen problem: it's hardware.
Source: Kotaku.comThe smarty pants at French language website Logic Sunrise got out its 40X microscope in hopes of seeing what exactly was causing the PSP-3000's interlacing issues. The problem, it seems, is that the pixels are arranged horizontally, and the blue pixels are much darker on the PSP-3000. Meaning? Those Logic Sunrise people should get a job at Sony or something, and this seems to be a hardware problem. No wonder the company has "no plans" to fix this.