Finally i god my iMac working. The problem was that 1 pin of the LVDS cable (Or the DisplayPort Cable) was disconnected from the cable. So for anyone that might have a problem like this, with no backlight, on the iMacs 2012 or newer that have the backlight controller integrated on the motherboard, make sure that the Cable that connects the display data to the motherboard, is not damaged. I had to put it under microscope, because there was no way to find it out just looking at it, considering how small those pins are.
+
Finally i got my iMac working. The problem was that 1 pin of the LVDS cable (Or the DisplayPort Cable) was disconnected from the cable. So for anyone that might have a problem like this, with no backlight, on the iMacs 2012 or newer that have the backlight controller integrated on the motherboard, make sure that the Cable that connects the display data to the motherboard, is not damaged. I had to put it under microscope, because there was no way to find it out just looking at it, considering how small those pins are.
Although the LEDs have a power connector, if the DisplayPort cable (LVDS) cable does not send the command to power on the LEDs, it will not power them.
Finally i god my iMac working. The problem was that 1 pin of the LVDS cable (Or the DisplayPort Cable) was disconnected from the cable. So for anyone that might have a problem like this, with no backlight, on the iMacs 2012 or newer that have the backlight controller integrated on the motherboard, make sure that the Cable that connects the display data to the motherboard, is not damaged. I had to put it under microscope, because there was no way to find it out just looking at it, considering how small those pins are.
Although the LEDs have a power connector, if the DisplayPort cable (LVDS) cable does not send the command to power on the LEDs, it will not power them.
Take a look at the picture.
[image|532278]