Chosen Solution
I have a powerpook g4 with a broken screen. I replaced it, but I have a white screen (no display). I plugged in an external screen and it came great.
I change video cable also but still white screen
Here’s a link with great pictures of someone who had the same broken screen problem you have. http://www.david-reitter.com/software/Po… The first thing to do would be to reseat your cables and review carefully the installation instructions you can find here: PowerBook G4 Aluminum 15" 1.5-1.67 GHz Display Replacement Are you sure thenew display was good? Where did it come from?
Looks like a LVDS (video) cable issue. Double check the connections to the main board and to the LCD panel.
