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Model A1311 / Late 2009 / 3.06 or 3.33 GHz Core 2 Duo processor

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Why Does My iMac Screen Flicker or Just Not Work?

I have an early 2009 21.5 inch iMac. The vast majority of the time, my iMac screen doesn’t work. I power up the iMac and the screen flickers once and then just turns off, but the machine itself runs fine, and there is video output to an external display. The problem started a few years ago and it started as just some minor backlight flickering, but eventually the screen stopped working completely. I have gone through all the basic troubleshooting steps (I.e. reset the NVRAM and PRAM) and none of them work. The screen only works when I leave it sitting for a long time (sometimes as long as a month), and then it powers up fine, but after about 15 minutes of use, the screen starts flickering and then just turns off completely. Any and all help would be much appreciated. :)

Answered! View the answer I have this problem too

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You likely have one of two possible issues

  • The LED Driver Board has failed
  • The display backlight board connector has failed

You need to open the system and check your voltages.

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4 Comments:

How do I check the voltages?

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@Tobin Redekop - Using a DVM

I think your best bet here is to find a local shop who can help you as this can be dangerous! 120 voltage is nothing to mess with without a good understanding of basic electronics and electricity.

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@danj I didn't know shoes were powered by electricity :P.

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@nick - Funny!

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Tobin Redekop will be eternally grateful.
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