Model A1312 / Mid 2010 / 3.2 GHz Core i3 or 2.8 & 3.6 GHz Core i5 or 2.93 GHz Core i7

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Blacklight, temperature, lcd, screen,

Hi guys

I have a problem with my iMac i7 27" late 2009.

sometimes the screen goes black for no reason. I try to put the flash from my iPhone on the corner of the screen and I can see the icons. Every time that I turn on my iMac after few minutes the screen goes black again. I leave the iMac until stand by and I come back to it after 10 minutes, the screen work again but after few minutes black again. I was thinking there are some problems with temperature sensor or my back light led doesn't work properly. I will insert few pictures from temperature gauge if you would to have a look.

Those picture are about 10 minutes working.

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After those one just for the LCD temperature it's grow up in about 10 minutes.

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Please let me know and help me to fix this problem.

Answered! View the answer I have this problem too

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When it goes dark can you see the desktop with a flashlight?

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Yes I can see the desktop with a flashlight. Not really well but I can.

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Hello Claudio Pili, I have the same problem, What do you do to fix the iMac? Please Healp me. Thanks.

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Chosen Solution

Replace the LED Driver board. Here's how: iMac Intel 27" EMC 2390 LED Driver Board Replacement

It replaced the inverter but does the same thing.

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ok, I will try to replace the LED driver board. I will come back to let you know.

thanks a lot for the moment. :)

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Claudio Pili will be eternally grateful.
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