Model A1224 / Mid 2007 and Early 2008 / 2, 2.4, or 2.66 GHz Core 2 Duo processor

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1/3 of Display is dim... Which part to check/replace?

I have a 2007 Aluminum iMac with a display that dimmed in the upper 1/3 of the screen (suddenly, a year or so ago). I would guess it's about 20% dimmer and gradually gets to full brightness in the bottom 2/3.

I was just about to buy an eBay LCD and follow these awesome iFixit instructions when I saw that there might be other causes to this...

So my question is: What is the easiest way to diagnose this issue? I've read here that it could be the inverter, the CCFL in the LCD, or even a loose wire. Has anyone else had this issue and gone through with a repair? If so, what ended up being the cause?

If it was the LCD, could I replace it with one from a 2009 iMac?

I was also planning to upgrade the HD so I'm looking forward to taking this thing apart... but hopefully as few times as possible!

Thank you in advance for your ideas!

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The only success I've had with this issue is replacing the LCD. Yes, I've used a year earlier one and it worked fine and cost a lot less, but I also had it in stock so it didn't cost me anything to try. I believe there will eventually be a recall on these screens so save your receipts.

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Thank you for your response mayer. Since my computer is 4 years old now, I probably won't count on a recall... That said, it is good to know that different years' screens are compatible (within reason). I'll begin to scour eBay for 20" LCD parts.

Thanks again!

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Karl will be eternally grateful.
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