Chosen Solution

Hi everybody, I have serious issues with the backlighting after I followed the instructions to replace the internal hard disk by an SSD drive - everything else works fine and I have no other issues. Can anybody tell me please what could have gone wrong and if I could fix that myself? Those are the major issues:

  1. Clouding in the lower part of the screen - many bright spotlights with darker spots in between
  2. Brightness will not increase if setting the brightness bar higher than 7 dots
  3. Screen goes sometimes completely black. No software issue as I see in very bright environment light or with a flashlight that screen itself is showing a normal picture. When it goes black, I cannot do anything to get it back working. After a restart sometimes it’s bright again, sometimes not. Any help highly appreciated! Thank you!

‘’’++@mmarkus++’’’ what you see is stage lighting effect. This can be caused by a bad ‘fraid display cable. Since you just worked on your iMac I suggest that you double/triple check that your cables are all seated properly and that they are in good working order. It can also be caused by some failed capacitors on the “return line” from your backlight LED’s. Post some images of your board, specifically the area around the display connector, with your question. That way we can see what you see. Use this guide Adding images to an existing question for that Of course, it is also possible that you have a bad LED strip in your display, but this is unlikely.

The issue was caused by a loose power cable. When I fixed it by pushing it in with the outer edges and making sure it sits tight it perfectly works again!