iMac 27" screen shaking and flickers

[Nesbi90]

I'm looking for help to solve my problem with the screen of my iMac.
The screen flickers and shaking.
I have searched and found the groom guide how to fixer dim problems, but not this problem.

if I connect an external monitor, then the problem is not on the external display, so do not think the graphics card is faulty


Are there any iMac experts out there who can help?

Link to video: http://www.youtube.com/watch?v=iF0kQf8MAqk&sns=em

 

[Habberkuk]

Have you recently opened it?
It sounds like a failing LCD, a lose connection, bad cable, or things like that.

 

[touchUpInside]

from the video, it looked open

 

[Nesbi90]

Have you recently opened it?
It sounds like a failing LCD, a lose connection, bad cable, or things like that.

I buy it as defective with this error. I opened it, to check if there was a loose connection

 

[DeltaMac]

I think that you have a bad internal video cable, called a display port cable.

That's a good first step to replace that cable.
If the issue continues, then you probably need a replacement LCD panel.
(That's likely why it was sold broken. )

 

[Nesbi90]

I think that you have a bad internal video cable, called a display port cable.

That's a good first step to replace that cable.
If the issue continues, then you probably need a replacement LCD panel.
(That's likely why it was sold broken. )

I have just test lvds cable with a multimeter and it work
So The screen is broken

 

[DeltaMac]

Unless you have a method (and the specs) to test for inter-lead capacitance and impedance (and know if it should be high or low) - all you are doing is testing that cable for continuity. All you can say is that the cable might be good, but best test is to try with another cable.
Then again - it was sold to you broken, and yes, likely the LCD panel...