iMac LCD jumps from blue to black

Question

iMac Intel 20" EMC 2266

Model A1224 / Early 2009 / 2.66 GHz Core 2 Duo processor

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Sam @capacitor

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Postado: 30 de nov de 2019

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iMac LCD jumps from blue to black

This beautiful Intel based iMac 20” early 2009 at startup jumps to a blue screen with a lot of visual noise (just for a second) and then turns black and stays black.

I’ve checked the screen for image with a flashlight, no signs of a faint image.

I’ve disconnected all LCD cables (except for the temperature otherwise fans go crazy), hooked up an external screen through DP and the DELL external screen shows perfectly clear image.

The diagnostic LEDs are burning as follows: 1: green 2: green 3: off 4: green.

Inverter or screen, what do you think?

EDIT: upon closer look I find that LED 3 isn’t off but is actually missing! I believe this is the GPU indicator (someone confirm?) and since external screen shows image I believe it works.

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No diagnostic LED #3 Apple didn't populate it on this series.

30 de nov de 2019 por Dan

I find it awesome that you know such a specific fact.

30 de nov de 2019 por Sam

Using a flashlight held on the screen at a sharp angle do you see the faint image of your desktop?

30 de nov de 2019 por Dan

Ah yes I forgot to mention in opening post. No sign of image with a flashlight either.

30 de nov de 2019 por Sam

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Dan @danj

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With no image that tells us the display its self has failed. On the backside under the covers is another board called a T-CON. In your case this is the part that has failed. Sadly there part is not readily available, you’ll need to replace the full display.

20” Display Assembly - Apple P/N 661-4983

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Includes the part number, that's amazing thank you.

30 de nov de 2019 por Sam

I can get my hands on a 20" LCD from a A1224 2008. Seller can only give me panel number: M201EW02 which is similar to my 2009 LCD. Any idea if fits my early 2009 version? Can't find this info anywhere.

1 de dez de 2019 por Sam

M201EW02 is just the panel ID vs the Apple part number which is the same!

1 de dez de 2019 por Dan

For future reference: 2008 replacement screen fits and works 2009 model, however you need to transplant the 2009 LCD temp cable to the 2008 one as the older one has a 4 pin connector that doesn't fit the 2009 motherboard. Thanks Dan, all the best!

3 de dez de 2019 por Sam

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No diagnostic LED #3 Apple didn't populate it on this series. — Dan
Using a flashlight held on the screen at a sharp angle do you see the faint image of your desktop? — Dan
Ah yes I forgot to mention in opening post. No sign of image with a flashlight either. — Sam
I can get my hands on a 20" LCD from a A1224 2008. Seller can only give me panel number: M201EW02 which is similar to my 2009 LCD. Any idea if fits my early 2009 version? Can't find this info anywhere. — Sam
M201EW02 is just the panel ID vs the Apple part number which is the same! — Dan
For future reference: 2008 replacement screen fits and works 2009 model, however you need to transplant the 2009 LCD temp cable to the 2008 one as the older one has a 4 pin connector that doesn't fit the 2009 motherboard. Thanks Dan, all the best! — Sam

iMac Intel 20" EMC 2266

iMac LCD jumps from blue to black

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