Chosen Solution
I swapped my 27" iMac Late 2013’s HDD to Samsung EVO 850 1TB SSD. Original aim is successful and the iMac is blazing fast now. But while trying to close the iMac screen, all adhesives lined up, I connected the display’s power cable and ribbon cable. Mistakenly, I lifted the display while trying to align bottom and ouch….the ribbon cable (vsync cable??) pulled out from its connector argh….. I connected it back and closed the iMac. When I powered up there was a green vertical line (which was gone after a min) and the gray/black thick stripe about 1.5inch wide. This stripe stays all the time from boot to shutdown. Tried SMC reset, PRAM reset… no luck. I doubt the ribbon cable damage (is it vsync cable)…now I’m skeptical to reopen to play around without knowing what could be the issue. Many questions on my mind….did I damage the display? Is the ribbon cable replaceable (I tried googling for spare part couldn’t find a proper lead)? Any help would be much appreciated thanks.
Take a look at this question I suspect you have the same issue: I’ve got vertical lines on my iMac 27" screen.
Exactly the same problem with me. No way to repair this? I´ve taken all the extra cares doing this, still encountered the same problem… :( When plugging it back, a black bar on the right side… Any suggestions?
I know this is a very old thread but I believe I have solved the mystery. I purchased a used 27 iMac 5k with 3 black lines on the right hoping I could fix it. I tried everything to figure out why it was bad, GPU, cables, cable connectors, etc. I’ve also read every question on this topic on this site. It was not until I removed the metal shield on the top rear of the LCD that I saw that it had several cable ribbons from the long PCB connected to the screen. At first I thought the leads were bad, but upon closer inspection I noticed three of the ribbon cables were cut. 3 black lines on the right. 3 ribbon cables cut on the right. It appears that when the last person tried to get into this, they may have used a sharp blade or razor to cut the adhesive. In doing so they sliced too deep and cut into the ribbons! I don’t know if the ribbons can be replaced or the rear PCB. I have never seen it sold anywhere and the soldering is so fine it can’t be done by hand. :( See pics:
You have the same problem so just read all proposal tips abowe and I am sure you will solve this problem as those guys did. Good luck.
i think I am with the same trouble after changing hdd any tips are very welcomed
I opened my late 2013 27 in iMac to replace the broken hdd earlier this week and when I put things back together the screen stayed black (4th diagnostic light isn’t lit either,) one of the pins was bent on the vsync cable so I bought a replacement but still the screen is black. I was very careful with the screen, used the ifixit tool etc. Any ideas?
