Mid 2011 21.5" Purple Line - Diagnostics

[Spitfire411]

Hi, I posted this on Apple Support Communities but thought I'd try here as well

A few weeks ago, a vertical purple line appeared on my mid-2011 21.5" iMac screen, one or two pixels wide from top to bottom.
I do not have AppleCare.

I took it into Apple and they said it would be $450+ tax for a replacement LCD. Talking to another repair shop, they did not rule out the Graphics card being faulty.

I feel that paying for Apple to repair the LCD is too expensive at this point in the iMac's life.
I have found a used screen for sale online for ~$150 and the iFixit guide does not make it look like a very hard repair.

I am wondering if there are some other diagnostics I can do before trying to repair the LCD screen to ensure it is not a graphics card/logic board issue.

If I hook it up to an external monitor, and it was a graphics card issue, would the purple line be visible on the external monitor as well?

If I AirPlay to my Apple TV, it isn't visible, but a computer tech said that AirPlay would use the Apple TV's graphics card to display the mirrored screen.

I also saw that if I take a screencapture, if it is a card issue, it will be visible in the screencap. If an LCD issue, it will not be visible on the screencap.

Any insight into this issue would be appreciated.

Thanks

 

[Confusius]

Hi, I posted this on Apple Support Communities but thought I'd try here as well

A few weeks ago, a vertical purple line appeared on my mid-2011 21.5" iMac screen, one or two pixels wide from top to bottom.
I do not have AppleCare.

I took it into Apple and they said it would be $450+ tax for a replacement LCD. Talking to another repair shop, they did not rule out the Graphics card being faulty.

I feel that paying for Apple to repair the LCD is too expensive at this point in the iMac's life.
I have found a used screen for sale online for ~$150 and the iFixit guide does not make it look like a very hard repair.

I am wondering if there are some other diagnostics I can do before trying to repair the LCD screen to ensure it is not a graphics card/logic board issue.

If I hook it up to an external monitor, and it was a graphics card issue, would the purple line be visible on the external monitor as well?

If I AirPlay to my Apple TV, it isn't visible, but a computer tech said that AirPlay would use the Apple TV's graphics card to display the mirrored screen.

I also saw that if I take a screencapture, if it is a card issue, it will be visible in the screencap. If an LCD issue, it will not be visible on the screencap.

Any insight into this issue would be appreciated.

Thanks

I had similar coloured lines in my 1st gen iPad - it was an LCD issue. You should e-mail your screenshot to someone to check for the line, or post it here.