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How to make a headless older PowerBook work
Authored by: billclinton on Nov 17, '05 04:54:33PM

This is probably the best forum I'll find for comments on my TiBook display problem. Periodically, roughly once per day, the display will (1) stop re-drawing and at the same time (2) go berserk by displaying inappropriate images. The "inappropriate images" are of several styes and may appear in different combinations; they may also morph from one to another. First, the displayed image will fade and gain perhaps some narrow vertical or horizontal stripes. Then, typically, it gain wider stripes of various colors, then continue morphing the fade until there are green organic-shaped blobs slowly morphing on a mostly black background. (I'm not kidding.) On some days, the display will suddenly revert to normal functioning for 1-3 seconds, then start over. If left long enough, it might become all black or all white, but then can start up with the organic shapes again. Almost never happens immediately upon waking from sleep if the machine has been asleep for several hours (e.g., overnight), but will almost always re-start if it has already begun and I just do a quick sleep-wake cycle.

To me, this represents some kind of inter-pixel communication on either the display itself or in video RAM. I've tried checking everything that I can think of and have ruled out choice of power supply (AC versus battery), battery state, device temperature, ambient temperature, and phase of the moon.

After an initial sequence of this bad behavior, I thought I solved it by wiggling the thick wires running into the right-hand hinge (when laying upside down), but that "fix" eventually failed. I enjoyed a few months of relatively good behavior, including a three-week trip to Spain (why don't they ground their mains?). But upon returning this summer to the U.S., the problem became untenable.

After several months of this (I normally use an external monitor), I solved the problem by buying a new computer.

Any ideas on what caused this problem?



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How to make a headless older PowerBook work
Authored by: ret on Nov 17, '05 07:34:00PM

I had what sounds like the same problem on first edition TiBook. Vertical white lines would appear on the screen, gradually filling it. If left alone, these would eventually become greyish blobs. This might occur within seconds or possibly hours of opening the lid, but got progressively less, until it became unusable without an external monitor.

It turned out to be the ribbon cable within the hinge had frayed and eventually broken. Had to replace the whole screen-half of the laptop, since the ribbon cable can't be replaced separately. Hooray for Applecare ;-)

The AlBook has a different hinge arrangement which is apparently a lot sturdier.

cheers
RET

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perl -e 'require Signature.pm; srand; printf STDOUT "%s\n", $Signature[rand @Signature];'



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