Chosen Solution
Hi all. My mid 2011 21.5” iMac has been acting very weird. So there is no image displayed on the screen, but If I shine a torch on the screen I can see everything. This leads to the conclusion that the backlight has failed. I also know that it is not the LCD that is the issue as I have another iMac of the same model which I plugged the LCD into and it worked fine. I replaced the LED Backlight driver board and still I get the same result.. The Image is only visible under a torch light. I am open to any suggestions/ideas of what the problem would be. Some other info:
- The image is also visible on an external screen using the Mini display port.
- I also managed to get to the recovery window just by using a torch so its not the HDD
- All indicator lights light up, including LCD one which means the computer is communicating with the LCD If it is needed i can upload photos. Cheers Update (02/20/2020) @danj Could you please give me some more in-depth information so I can let the person I got the backlight driver from know? Also below are images of the connectors on the screen.
https://imgur.com/dSiznVA Update (02/20/2020) @danj Here are some photos of the wires
https://imgur.com/gcprOHy I hope this is what you meant. Cheers
In a dark room start your mac your screen should have a bit of glow. If you don’t see the glow the issue is still the backlight power source and its connection to the LCD. I’m suspecting you got a bad part. You’ll need to replace it again. iMac 21.5" LED Backlight Board (used) Apple P/N 661-5976 Review this guide to see if you missed something: iMac Intel 21.5" EMC 2428 LED Driver Board Replacement
