Black screen while backlight works, display data cable replaced.
I basicly have the same problems with my 2008 15" MBP (no unibody) as this question:
The MBP was as first brought to a repair company, but when the laptop was there for over 2 weeks, the display worked fine and they ran all possible tests they could run without the screen turning black. When I got my MBP back from this company he indeed worked fine! For 2 months... the problems started again with as result no image at all. Only the black screen with the backlight on. (MBP runs fine on external display).
Now I knew it for sure, the Display Data Cable was broken. So now I decided to replace it myself. I bought the cable (MacBook Pro 15" (Models A1226/A1260) Display Data Cable) and replaced it.
Now the worse part, it still does not work! Is there anything else I can do to fix this? Can I turn the laptop on while it's opened? Can I run some faulty connector tests?
The MBP is an early 2008 model which still is working great on the internal parts :(
Is this a good question?