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iMac Intel 27" EMC 2309 (Late 2009, Core 2 Duo 3.06 or 3.33 GHz) ID iMac10,1, EMC 2374 (Late 2009, Core i5 2.66 GHz or Core i7 2.8 GHz) ID iMac11,1

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Vertical lines on screen (moving "noise" lines)

They are transparent and only can be noticed with certain color backgrounds. Very small vertical moving "noise" lines at various places on the screen of my 27" late 2009 iMac the noise or flickering in the thin vertical lines seems to move upwards.

They typically appear as 2 or 3 lines next to each other with a very even distance between them, nearly exactly 1 cm. I've got a cluster of 3 on the left side of my screen, a few clusters of two in the middle and a few on the right side as well.

From my usual working distance of approximately 65 cm they are basically invisible, but from a somewhat closer distance of 40 cm they are very obvious.

The video card was affected by the big pink lines and “snow effect” issue and succesfully fixed with the “cooking the GPU in the oven” method.

But these lines I’m reporting here now have always been present before and after “fixing” the video card.

This makes me think it's a LCD issue.

I’m here to ask what this issue is (it is very difficult to take a shot):

Block Image

Any help is appreciated.

Ответ на этот вопрос У меня та же проблема

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Hook up an external monitor. If the lines are there, you have a GPU issue. If the lines are not there it may be in the LED driver board:

iMac Intel 27" EMC 2309 and 2374 LED Driver Board Replacement

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i've already connected an external monitor and there's no issues on it.


FYI this imac has a blank screen random issue too, exactly same as this Backlight turning off, inverter-board changed. and (for this user) replacing new inverter board didnt help he to fix the problem. really don't know how could i do..


Your machine does not have an inverter board. Like I aid, your next place to look is the LED driver board.


@mayer i'm sorry inverter board or led driver board aren't the same board?


An LED driver board also does the job of the old inverter boards


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Anyone could give me help for this issue? Thanks

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Same problem here, would really like an update on this as well!


Same problem here. Did you manage to fix it?


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