Chosen Solution
Hi mayer, in my case I can see the desktop when I hold a flashlight to the screen. It looks like I damaged the LED backlight power cable when reassembling the iMac (it’s a iMac 21.5" EMC 2389). I tried to fix/solder the cable but it still is not working. I had a look at the LED driver board but I cannot see any visible damage. So can the LED driver board be still damaged or could it be the backlight itself that’s shredded? What would your next step be in this case? Thank you very much in advance
I would hook it up to an external monitor to see if the GPU was generating a good image. If not, do a rework of the GPU board (the most common failure on this model).
