Display gone irremediably all white (or gray)!

Suddenly my display has gone all white (or light gray). I have tried reseting the PRAM, NVRAM, startup with R key. At startup, my 1Ghz PowerBook will show an all light gray/white LCD, flicker once after 10 secondes and remain light gray or white. The brightness adjustment still works and so does the external video connection (DVI). If I startup the PowerBook lid open with an external display, I can see that Mac OS X has detected my LCD as I can "see" and place it in the Display preferences.
Could it be that the LCD inverter board failed?
Thanks for any help on the failure (other than returning it to Apple as it is out of warranty and I'm not ready to shell USD800 or so to replace the entire LCD).
Arnaud
PowerBook 17 1Ghz Mac OS X (10.4.3)

I have something similar happening. I found that it starts by flickering and then after a minute or two, the whole screen goes white. Sometimes I can fix it by moving the screen to a new position, but quite often I have to put it to sleep and wake it up. That doesn't always work either.
I took it in for repair. They took it apart and put it together, and then couldn't reproduce it. Well, its been almost 2 weeks and the flickering started reappearing. The repair guy said that if it comes back, the only thing they could think to do was replace the LCD.

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