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Model A1311 / Mid 2011 / 2.5 & 2.7 GHz Core i5 or 2.8 GHz Core i7 Processor

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Will iMac run without digitiser?

Hi. So I have a 2011 21.5” iMac. It works perfectly fine except the screen won’t light up but if I connect the iMac to my TV I can see on the TV. So what would be causing my screen not to work? The screen itself is not faulty as I have 3 other lcds which I have tested and they all work. Would this be the digitiser? What would be causing it not to show up?

Ps. All the ports on the logic board are fine so it’s not that.

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iMac's doesn't have a touch screen which was a 'digitizer' is used for to identify where your finger or stylus is located on the screen.

Your display does have a backlight to light up the LCD from behind so you can see the screens image.

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Okay. So you think it would be the LCD backlight preventing the screen from lighting up? Are there any other things that could cause the problem? Anything helps. Cheers @danj

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1 Answer

Chosen Solution

Take a flashlight and set it on the screen at a sharp angle can you see the faint image of your desktop and its icons?

If you can that points to the backlight. If you don’t then the LCD its self has a problem.

To fix the backlight will require a new LED driver board, Apple P/N 661-5976 and here’s the guide: iMac Intel 21.5" EMC 2428 LED Driver Board Replacement as long as the cables are not damaged.

A bad LCD will need either new cables or a new display

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@danj thanks for the info. The link you gave me didn’t work. Could you please advise me one that does? Cheers

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Double checked both links work!

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@danj

Thank you heaps for the information! I shined a torch at the screen and sure enough saw the logos. Just ordered a new LED Driver board. Thank you!

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