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Model A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac12,2

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No Display on in built screen. but has display to external.

The Main in built screen does not give any display what so ever, its completely black. The unit turns on and gives the start up sound. It also can display to a external monitor connected through thunder bolt. I have replaced the screen with no luck and I have also replaced the led driver board with no luck. the logic board shows 4 green lights as well.

any help would be appreciated!

Answer this question I have this problem too

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Open it up and check if the LVDS (display data cable) is damaged or loose. Try a known good display data cable. If this fails replace the LCD.

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I'll give it a shot

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Tom will be eternally grateful.
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