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A1418 / EMC 2833 / Ende 2015 / 3,1 GHz Core i5 oder 3,3GHz Core i7 Prozessor. Erscheinungsdatum 13. Oktober 2015.

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Purple Hue on the edge of the Screen after SSD UPGRADE

Hi iFixit,

I recently replaced my hard drive with an SSD using this bundle: iMac Intel 21,5" Retina 4K Display Festplatte austauschen

The speed works great and the repair was easy. But I noticed that there’s a purple/purple hue on the left and right side of the screen.

Do you know what the reason for this might be ? I want to order more adhesive and fix it up, but I’d like to know if you have any ideas before I start.

Thanks,

Rama

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@rama_watts - Did you use the special adhesive cutter that comes in the adhesive strips kit?

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Yes, and I also made sure not to push the card in more than 3/8"

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@rama_watts - Double check to make sure the internal display is the issue. Plug in an external display does it come up clean?

The newer iMac's 2012 and newer use a different video dialog (iDP also known as eDP vs the older LVDS). Think it like the difference between analog vs digital TV the over the air signal often has ghosting and other artifacts unlike the newer digital signal. The only area which makes sense here is either an issue within the displays T-CON board or the main logic board.

Isolating which using an external display is the only way I know how to figure this out.

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@rama_watts Blue/Purple hue issues are actually most commonly caused by LED backlight issues.

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@oldturkey03 - I've never seen the LED's alter their color other than yellowing from burning the reflector plastic.

Can you expand how the backlight LED's alter their color here into the Blue spectrum, The only thing I can think of would be the driver voltage being too high not the backlight in the display its self. Yet I've not seen this in all of the systems I've fixed.

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OMG, you have the dreaded Hendrix, "Purple Haze" problem, RUN it may be contagious.

https://www.youtube.com/watch?v=cJunCsrh...

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@mayer - A more current Purple reference would have been Prince - Purple Rain the vid has lots of purple haze! ;-}

I don't know of many people who ever heard Hendrix who I love! We're both showing our age ;-{

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Purple hue generally points towards a signal problem. Check the video connector for loose/damaged connection between the LCD and main logic board. Be sure to check both ends. Hopefully a simple reconnect will fix this.

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How do I check the video connector? Do I have to open up the Mac again?

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Hi Rama

The video connector for iMacs is generally a 30-pin wide gold plated connector coming from the back of the screen to the main logic board. You'll want to check for bent pins on the cable and damage to the connector on the board. Making adjustments to this cable could fix your issue if there is no physical damage to the LCD panel/Screen Assembly itself.

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@refurbpro - LVDS signaling was used in the older iMac's (2011 and older). When Apple went with the thinner iMac's they switched to iDP (eDP) signaling which is like the difference between analog TV Vs digital TV.

The haze issue you might encounter within LVDS connections just doesn't happen here with iDP.

Here's a good source of display defects Sony T-CON training manual as well as iDP (Internal DisplayPort) Technology Overview & DisplayPort

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@danj I really appreciate the info! I can only suggest solutions that have worked for me in the past, but I'm always willing to take a deeper look.

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@refurbpro - Most haze issues I've seen on the newer models tend to be either image persistence issues or pressure marks from the act of taking the display off around the edge areas. Both issues can be fixed by new screens.

Seeing a picture or two would help in ID'ing which was the cause.

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@rama_watts Sadly, you’ve isolated the issue down to the display. Some how you managed to damage it in the process of taking it off.

You’ll need to replace it if you can’t live with the haze effect. Here’s the needed part iMac 21.5" LCD Display Panel - Retina 4K (used) P/N 661-02990

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Rama Watts wird auf ewig dankbar sein.
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