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

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What part number and how do I replace the backlight?

The top 1/3 of my Imac 20" is darker than the rest of the screen. I assume I need to replace the backlight and potentially the entire display? Can someone help me figure out what the part would be that I need to order?

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Is it the top 1/3 or top 1/2 of the screen? Does it fade from the middle and get darker as it goes to the top?

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Since ifixit dont seem to stock the inverter as s spare part I thought I'd mention that that well known auction site has inverters listed as low as US$20 so it may be an option for you to try for not much money

The LCD tear down guide on this site states

"During reassembly, the order of the inverter cables is interchangeable within each socket."

It may be possible to determine if it is the inverter or the CCFL's by swapping the upper and lower connectors... if the cables are long enough

WARNING - the CCFL operating voltage can easily exceed 1000V. Personal injury or damage to the iMac is possible if contact is made with this voltage

If the dark part of the screen moves it is the inverter and if it does not then it's the CCFL in the LCD.

It looks as though the LCD is the same/similar as used in the Dell SP2009Wc. If so The CCFL are edge mounted and there are 2ea top/bottom of the LCD. Looking at the cct diagram for the inverter suggests that the CCFL should run separately so 2 CCFL across the top not working suggests the inverter not the CCFL as I'd say it was unlikely 2 CCFL would fail at exactly same time... This suggests inverter to me...

UPDATE

My guides - Removing CCFL Assemblies from iMac Intel 20" EMC 2133 and 2210 LCD (part no LM201WE3) and Removing CCFL from iMac 20in LCD CCFL assembly were inspired by this question

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Looks like you need a new LCD, but iFixit only sells the glass, you'll have to search elsewhere for that.

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I took the display out to see what model it was and I have the LG.Philips display part number LM201WE3(TL)(F5). Should I try replacing just the CCFL or the entire display?

Are there other compatible models to make my parts search more broad?

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Hi Joe, the manufacturing part may assist you in finding the OEM supplier but I'd be you wont buy one that way..

If you can remove the CCFL assy it would be worth at least trying... Your description suggests that only part of the back light assy is failing. It could be a simple loose connection too.

The manuals have no detail on replacing the back lights...

It could be the inverter...?

The Mid 2007

LCD Assembly, 20” part no 661-4434

Inverter Board 922-8204

The early 2008

LCD Assembly, 20” part no 661-4671

Inverter Board 922-8507

HIH

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There are a couple of links to CCFL replacement on laptops but they will at least give some guidance and general idea of what is involved in replacing the CCFL.. still trying to get a specific procedure for you though

Link 1

Link 2

Quote from link 1, "The average life for a laptop backlight is on the order of 30,000 hours, or more than three years of 24 hour a day use. When the backlight in a laptop flickers or fails, it's more likely the inverter than the CCFL tube."

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