Apple Powerbook damaged screen - fault diagnosis

HI
I have an Apple Powerbook G4 which has been dropped. The screen is physically intact, although one hinge is broken so the screen is attached to the main case at one end only. When it powers up, the display is 'scrambled' flickering horizontal lineswherever there is an image. I've hooked it up to an external display which displays fine. I've opened up the main case and screen casing & 'jiggled' cables, disconnected cables, etc, but no change to the display. Do you think it possible to determine which component is the source of the image problems. As I say the LCD unit itself looks intact.
ComputerFundiAsked:
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ridConnect With a Mentor Commented:
The LCD screen has to get the signals into the little transistors in each pixel. The signal comes to the screen assembly through the ribbon cable from the mobo, goes through some electronics and eventually enters the screen proper trough the edges by means of a strip-like connector that touches the edges of the screen. If these connector strips are loose or have become upset, you can get that weird flickering. I'm not sure its possible to mend, but I haven't tried it, so....
/RID
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Arthur_MinoCommented:
G'day,

The video cables run thorough the hinges, most probably they're damaged. You can also try opening the screen with the 4 screws around the side edges and pull the screen apart, as it is glued together.

Have a look on ebay for cheap spare parts.

Hope this helps,

Cheers,

Arthur
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ridCommented:
Could be the edge connectors to the screen proper that have become unseated. This may prove a bit tricky to fix; a replacement screen may be a better way to go.
/RID
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ComputerFundiAuthor Commented:
rid - edge connectors? please describe what they look like and where they are.
Thanks
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Arthur_MinoConnect With a Mentor Commented:
G'day

Check this link out.
http://homepage.mac.com/sysop/PhotoAlbum13.html

Slide 65-68 shows the video cable that goes to the back of the screen. I suspect your problem is in the cable as it's extremely fragile.  
Also check out the condition on the other hinge 71, the power cables for the backligh of the LCD.

Hope this helps,

Cheers,

Arthur
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ComputerFundiAuthor Commented:
Thank You Arthur and RID. The owner has decied to bail out on a fix - I'm to remove the screen & then he'll use it like a desktop with an external monitor. Thanks both for your information - I have a better insight as to the various components that make up the video system and that link to the disassembly instructions was really useful Arthur.

Thanks

ComputerFundi
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blue_wirelessCommented:
You may need to check LVDS data cable connecting board and display
It eithet is loose or damaged. Go to http://acceasy.com, there are some Powerbook g4 lcd replacement repair part.

Be sure to identify yous model and part number at:
http://docs.info.apple.com/article.html?artnum=88248 
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