Screen tinted blue and with dark areas

When I tilt my screen backwards beyond right angle to the keyboard the colors get pale and blue-tinted and dark areas appear at the bottom of the screen.
It's an 18 months old replacement screen I had installed by an Apple dealer at great cost because the original screen just went black.
Any idea what this could be and how fixeable it is?

PowerBook G4 17"
1.67 GHz
W85xxxxxxxx
SEVEN lines at the moment and keep appearing. APPLE just doesn´t takes responsability on this issue. No responsability, no nothing. They just say " its more 600 euros for a new display". One more costumer that they lose. I was going to invest all of my office hardware design in new MACS but at this point, they left me in my own hands. A 2.500 euros Powerbook G4 screwed after 2 and a half years. Thanks a lot APPLE for taking good care of your costumers.

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