video still remain black with no image and no faint light on it.

Hello everybody, I’m new here and I have the same problems. However I’ve discovered that, when I pull off the cinema cable from Wall power source and disconnected the upper data connector from Logic board, once cinema power cable is connected again, then iSight, usb and audio Back in life but video still remain black with no image and no faint light on it. I have two A1267 24” Led Cinema Display with the same issue. I have tried to exchange both internal power supplies, both Logic boards and both displays.. by the way, I’m not pretty sure that Logic boards are in working order.

Thanks for your attention.

Cheers

Mauro

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Can you verify that the power supply outputs the correct voltage?

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