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| 22" ADC Cinema Display problem |
Posted by: beachycove on 2012-09-26 15:27:45
I bought one of these today untested, but with a 7 day return period if it doesn't work. It looked immaculate and would, I thought, make a very nice companion for my G4 Cube.
It doesn't work.
Before I bring it back, does anyone know what the likely cause of the following fault might be: a flickering, pixellated 2" vertical band or stripe of noise at the extreme left of the screen, varying in colour depending on the background (e.g., sometimes cyan, sometimes magenta), and not constant but episodic. That is to say, it flickers in and out, and can stay on the screen anything from a millisecond to 10 or 15 minutes. The screen can also work just fine for 10 or 15 minutes, followed by a constant lightshow from this fault.
It can also be part of that 2" vertical stripe or all of it (e.g., just the middle 5" of the band screen, or several bits of the band at any given time). It is also semi-transparent, so that the desktop can be seen beneath, but the desktop is distorted by the pexellated overlay.
I'd prefer to fix than to return, as the price was right — but I also know that parts for these things are pricey and scarce, and that LCDs are not always easily fixed.
Any ideas?
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Posted by: krye on 2012-09-27 05:37:26
Any sign of cable or pin damage? Is the cable pierced anywhere as if someone stuck a nail though it, or the cat bit it?
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Posted by: beachycove on 2012-09-27 06:27:57
Nope. I had it apart last night and did not see anything obvious.
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Posted by: Deacon Frost on 2012-09-27 15:08:28
What video card do you have in the Cube? I bought a 20" ADC Studio Display when I got my Cube earlier this year and couldn't get it to work for anything. Finally realized the card wasn't sending it enough power, put in a GeForce2 I bought off ebay, and haven't had a problem since.
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Posted by: beachycove on 2012-09-27 15:36:45
Tested on a high-end Radeon in a G5 as well as a Radeon 7500 in my Cube. It won't run from a stock Rage 128.
After fiddling with ribbon cables to no effect, I just decided to bring it back for a refund. Too much trouble, too little time.
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Posted by: olePigeon on 2012-09-28 09:30:50
It's possible the LCD itself was damaged. I have a bunch of 17" Core Duo imacs with the vertical lines. Requires a complete LCD replacement.
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Posted by: techknight on 2012-10-02 19:38:05
bad panel. Guaranteed.
As far as the core2 imacs go, the cheapest option is to replace it with a laptop screen and use an EDID/Pinout hack which someone actually made an adapter for now.
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Posted by: olePigeon on 2012-10-03 15:05:47
Yep. I'm ordering 5 kits for my school from Real Mac Mods. Comes with a new inverter board and an LCD for $150. Funny thing is that the new LCD is 1920x1200, so quite the upgrade for the little 17" iMac.
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Posted by: techknight on 2012-10-05 16:52:08
yup, modified EDID data.
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