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Model A1225 / Mid 2007 and Early 2008 / 2.4, 2.8, or 3.06 GHz Core 2 Duo processor

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iMac display ghosting and has horizontal lines

Hi, overnight my iMac has formed this weird display glitch and it’s hard to use now. Does anyone have any ideas on what it might be? I was thinking maybe a faulty video cable- or are we looking at a whole new display… It’s not graphics card because the ghosting didn’t show up in screenshots. Anyone have any thoughts, anything helps!

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Update (11/04/2021)

@nick @danj

I think this is good news… The picture on the external VGA monitor looks great! No ghosting or anything, but same mess on the internal monitor, does this help us on finding what our next steps are?

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( The external monitor looks like a ghost but it’s just bc the video is being streamed in 480 p so there are pixels) but here’s a better image of the ghosting on the iMac)

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I hope this help you see the problem better.

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A screenshot is from memory not at the GPU or display level. So that won't help you.

What you would need to do is connect an external display to your system via Mini-DVI connection so see if the external display image is clean.

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I’ll try that when I can get a dongle, Would changing the LDVS cable do anything do you think?

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Aiming at a dart board with a blindfold on is not very effective ;-{

Taking the time to properly breakdown the problem is the better way, otherwise you could add new problems.

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@danj my money is on a tired CCFL backlight/inverter. These were either released when Apple switched to LED backlighting, or they use CCFL and predate it by just 1-2 models. Mid 2007 tells me it's CCFL.

It just looks like a tired backlight to me, but as @danj said we need to see it on an external display. The issue now is we're dealing with these failures so soon because consumers demanded they fire up in a few seconds which trashes the tube, and really strains the inverter - and no, it's not just monitors.

If consumers could accept a 15-30 minute warmup, these wouldn't be as prone to death.

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Noted. Thank you!

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From what I can quickly tell from the photo, it looks like a worn backlight (or inverter) or LCD. The problem now that all of these are over a decade old is even if the inverter is bad, the tube may not be far behind. Unlike when these were never it's not as easy due to both being problematic and old since time is a brutal SOB.

I would try and inverter and see, but if the issue persists the panel is bad, either due to a backlight or driver issue. If the driver is bad there's nothing you can do but if it's the backlight you can do an LED conversion if you know how to, or it’s time for a new computer. You just cannot find good panels at realistic prices for these as the cheap ones are usually near the end of their life. If the hours are low and has years of life left it won't be cheap as those are hard to come by.

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What would be causing the ghosting? I see what you’re saying about the backlight, all four corners look dark and strained. Tbh it looks like the computer display is about to give up.

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@brayunique The ghosting could be the screen, RAM, GPU or motherboard. We need to see on an external display for that.

@danj the center majority wear pattern here points to the backlight just being flat tired. Look at how uneven it is from the bottom - that's an early warning sign.

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Ok. Thank you all, I will update when I get the adapter!

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@brayunique - This is not a backlight issue and as you’ve plugged in an external display we can see the issue is not present on it.

You clearly have a display panel level issue. On the backside of the panel is a small circuit board which paints the image based on what the GPU logic sends to it. This small board (T-CON) is part of the LCD panel as such you will need to replace the full assembly: 24” iMac (Alu) LCD panel,Apple P/N 661-4431 LG unit: LM240WU2 (SL)(B1) or (SL)(B2) or (SL)(B3) extension.

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Okay, Sounds good. Ill buy a replacement and update soon.

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@danj just curious. I know these are old enough to be harder to find a good replacement but are they completely made of unobtanium? I figured as such when I seen these use the old CCFL tubes.

Granted what I consider to be too old for production use is different since my general rule is to stay reasonably new, so factor that in.

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@nick - Raw CCFL's are just not made any more and many where disposed of due to the Mercury they use. You just don't find Mercury based thermometers being sold either! Not saying you can't find them its just very hard.

While that is a common issue with these older displays having burnt out CCFL's and/or inverters, you often can still find the full display available.

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@danj I find the issue is cost most of the time. It tends to total out the entire computer or monitor to the point I just put it aside for disposal.

I had an AL2216W but had to dispose of it due to a backlight failure that was either a bad power supply (inverter and supply were on the same board) or the panel. I didn't know how to check it properly. It stayed on for a second and died. I'd still need to learn how but it's not like it was in 2013. Also that guide on the AL2216W is almost 9 years old...

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