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Why does my iMac show no display on screen?

I'm working on an A1311 core i5 imac, and I get external display, but nothing on screen, I've replaced the LED Driver board with no luck, and bought another screen, still no luck. What fuse on the board sends power to the LVDS connector so the screen gets power?

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I have this same problem. I have a i3 3.2GHz. If I connect to an external display it does not show any internal display. So the LED Driver Board is only for backlight? Or does it also drive the LCD display? I also change the LVDS cable since I bent mine when inserting it again after opening the iMac. I wonder if replacing the LED Driver board would help or if the problem is something else? Logic board? GPU board?

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Did you ever fix this issue with the black screen?

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