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

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Screen randomly goes black 27" iMac late 2009

HI everyone

I have a late 2009 iMac 27"

I have been experiencing a random black screen I have already done a bit research to find a fix for the issue.

  • I have done the PRAM reset but no luck.
  • I have also done the torch test and I can see the screen in the background, so can I presume it's not the logic board?

I have seen a lot of talk about replacing the inverter board is this something that can be replaced easily? And does anyone know where I can purchase one within the UK.

Any helpful advice would be gratefully appreciated.

PS: I'm doing a test on the brightness currently running at 4 to see if it goes off.

Thanks Mark

Answered! View the answer I have this problem too

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Sounds like your LED driver board is breaking down. Here's the IFIXIT guide you'll need to follow you replace it: iMac Intel 27" EMC 2309 and 2374 LED Driver Board Replacement.

But before you replace it make sure the system is fully dusted out using a soft paintbrush and can'ed air to blow away the junk. Often the dust blocks the system from cooling effectively so parts can overheat.

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Ok just waiting on some suction cups then I will give it a good dust out. Also I reduced the brightness down to 4 and it's stayed on now since my last post I don't know if that any help diagnose the issue.

Also is it best to buy a new LED Driver or a refurbished one I see a lot on ebay?

thanks Dan for the advice

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To cut expenses, a used unit will be just fine here as your system is getting long in the tooth.

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ok thanks Dan I will let you know how it goes.

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Hi Dan

Just about to order the part, it is the LED Backlight Inverter Board?

thanks Mark

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Backlight Board - Apple P/N 661-5311

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mark.mcgivern will be eternally grateful.
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