Vertical colored lines block out large portion of the screen (LCD)
I have an iBook G4 12" (actually my daughter's). Sometimes 80% of the screen gets blocked out by thick vertical lines. Applying pressure along the top of the LCD will sometimes get it to clear up. The problem doesn't seem to be related to temperature. Waking from sleep after coming out of her cold car, it immediately shows the lines.
I don't have the external monitor cable for this model so I can't test it with an external monitor.
I'm guessing it must be a loose connection or bad LCD panel. Before I go buying a new panel, does anyone have any experience with this symptom.
If you say that pressing on the control board on the LCD assembly helps, then I would recommend replacing the whole LCD. It is extremely hard to find a control board (if you can at all) and MUCH easier to just buy a new LCD. You can go out and buy either a G3 or G4 LCD, they are they same and the G3 one might end up costing you less money. Hope this helps!
I know it's WAY late, but maybe someone will find this handy... If you take the backing off the display (4 small screws hold it in place), you'll see a piece of silver tape on the back of the LCD.. Peel that back, and you'll see a connector (plug). This is probably loose -- just wiggle the connector in and it should work like a charm.
Had the same issue after a drop and gave up for years, then recently decided to mess around with it and totally fixed it!