Damaged LVDS cable or damaged graphics chipset?

Hi everyone.

The iMac presents corrupted image problems after HDD replacement.

Let me illustrate the situation with some images and a video.

Block Image

http://d.pr/i/hnId (image)

Block Image

http://d.pr/i/HcrA (image)

Block Image

http://d.pr/i/OUi2 (image)

Block Image

http://d.pr/i/9ltG (image)

http://d.pr/v/exaz (video)

As you can see, there are some green vertical lines on the image. Appears on OS X and on Windows.

If you look at the video closely, you will see that the green lines go alongside with the Terminal icon accordingly with the movement.

The Apple Service Diagnostics 3S132. The test fails SOMETIMES with the following output:

72 [Video 2D acceleration test failed]

There is not other issues. No system crashes, no unexpected reboots, no performance issues.

So, I am thinking on these possible causes:

a) A graphics chipset related issue. A hardware failure caused by inappropriate manipulation of the computer. These are graphic glitches, or image corruption, caused by a malfunctioning chipset.

b) A screen related issue. The screen fails to properly show certain colors. The screen is damaged by inappropriate manipulation.

c) Damaged LVDS cable.

So, well, what do you think is the most probable cause of this problem?

Thank you everyone for your comments.

PD: Sorry about any possible grammar errors or other typos. English is not my native language.

EDIT: Thanks, machead3. The external display works perfectly, so the graphic card / mother board damage is discarded.

Also, do you know where to find instructions or photos on how to replace the LVDS cable? Thank you very much.

EDIT 2: Thanks again, machead3. You have been very helpful.

Answered! View the answer I have this problem too

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1 Answer

Chosen Solution

Connect to an external monitor - if you see the same defects it's the GPU/VGC - if you don't it's the internal display chain - (carefully) running the machine while you flex the cable (don't have to move it much) causes/stops the problem there is your source. If not then the LCD is likely

I think you maybe damaged the LVDS cable or it's connector (or failed to completely and correctly make a connection). Switching the HD. Many times DIYers "think" they've made a full complete connection, only to later realize it wasn't square, "snapped" in or cam locked.

If this answer is acceptable please remember to return and mark it.

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