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

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Black screen what is the problem

I have similar problem I can see little with torch light. But if I keep off the power for about 24 hrs sometimes it works fine.

Please guide me how to solve this problem

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If you see a faint image using a flashlight then you have a backlight issue. Often times I find the LED Driver Board needs replaced iMac 21.5" LED Backlight Board, Apple P/N 661-5304 and here’s the guide to put it in iMac Intel 21.5" EMC 2308 LED Driver Board Replacement

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Hindu crwdns2934231:0crwdne2934231:0
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