Model A1419 / Late 2013 / 3.2 & 3.4 GHz Core i5 or 3.5 GHz Core i7 Processor, ID iMac14,2

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LCD problem after changing ssd - help to narrow down symptoms?

Hi there.

After following different tutorials here, I decided to upgrade my iMac 27" late 2013 with a new SSD. But, unfortunately, when mounted the display assembly back the image is scrambled - I can barely see anything.

  • Backlight is good
  • Connecting an external monitor shows the image properly
  • Changed LVDS cable and shows the same thing. But, weirdly, after changing and reseating the cable once or twice, image appeared, and after a restart, disappeared again.
  • Cleared PRAM, and all sort of stuff

I believe it might be the display assembly, but just wanted to ask if someone had this issue previously, just to make sure I don't buy a new display assembly and then figure later on the problem is the motherboard. Below is a picture of what I'm seeing:

Block Image

Any thoughts?

Answered! View the answer I have this problem too

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To be clear here you pulled the logic board fully out and put in the blade SSD on the back side? Or, did you just swap out the HD for a SSD?


Hey Dan, thanks for your answer. I just swapped my hd by a ssd - so, no chance to be it.

I didn't try putting it backwards - did the same way the original was (with the original cable, the results are the same - just garbage on screen).

Funny enough, when I keep the lcd disconnected, using an external monitor, the system gets stable and fast. When I connect it, system gets crazy and slow - but works anyway.

Will try to do it and let you know.



Hey Dan. Just tried putting the cable in the opposite side, and I see the same image.

As I said, the way the cable is now I saw the image 3 times, and after rebooting, it didnt come back.


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1 Answer

Chosen Solution

You may in fact have a bad SSD unit if you put in the blade SSD on the backside of the logic board. Unlike the HD it has a direct connection to the PCIe bus so if its bad it will play havoc with the rest of the system.

If you had just swapped out the HD for the SSD, then I would say you put the iDP cable in backwards (FYI Apple changed the displays interconnect technology in '12 from LDVS to iDP in the iMac's)

Update (09/21/2016)

OK, so you just swapped out the HD for a SSD. And now you've double checked the direction of the cable.

So lets try this with the display not connected, connect an external display to your system does it work?

Also FYI you do need the OWC In-line Digital Thermal Sensor for Hard Drive Upgrade for 27" iMacs 2012 and Later otherwise your systems SMC services will go wacky here. I don't recommend using software over-rides!

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