Why does my G4 ibook display only work when it's partially open?

The display on my iBook G4 shows no video until I nearly close the lid. I can then see the display working but it is at an extreme angle. I'm thinking that it must be a contact problem, but cannot find any forum or troubleshooting support that address this issue. Does anyone know of a procedure to check and repair this?
Thanks in advance,
Randy

Randy,
I have repaired those inverter cables. The break is usually at the hinge point and often it's the red wire that breaks. If you open up the iBook (bottom case, top case (Be very careful with the power lead, it's easy to rip the socket off the logic board. I don't even attempt to unplug it, just free up the speaker cables and the power lead (blue and white) by pulling it free from the adhesive) and the top shield. (lots of patience required here to keep from bending the shield esp. near the top left). Often I'll just leave it connected and tape it to the display. You have to tease the inverter cable out and might have to remove the display to get full access. Note carefully how the cable is routed around the hinge. I tease the silver tape apart (often you can see the break - big black burned spot) so then I solder it back together, lots of tiny shrink tubing.
When I remove the top or bottom shield I'll tape the individual screws right to the shield near where they belong. 3M blue for this. That way reassembly is a no brainer. I used to measure the screw length w/ a metric rule and that took forever.
I also use a "black stick" that I made from a #3 black nylon propeller from the hobby shop. I cut it in half and tape the cut ends w/ self fusing electrical tape. The black stick is essential to releasing the tabs that hold the case together. Don't forget to release the one inside the battery compartment as I often find that one broken off in iBooks that come in for donation.
More if you email me but I won't be back in the shop until Saturday night.
Richard

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Luisa Montaini-Klovdahl, Ph.D.Licensed Psychologist &
Captain, US Army Reserves Medical Service Corps4153 Park Blvd
Palo Alto, CA 94306
Telephone: 650.384.6559
Facsimile: 650.384.6547 This e-mail may contain confidential patient information. If you have received this transmission in error, please delete and contact the sender.
From: aadeshs76610910 <[email protected]>
To: Luisa Montaini-Klovdahl <[email protected]>
Sent: Thursday, April 30, 2015 9:55 AM
Subject: Why does my Adobe Reader DC stop working when I click scroll down options?
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