Display power cable is bad?

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iMac Intel 27" EMC 2639

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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Ted @tmtweb

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发帖于: 2020年9月12日

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Display power cable is bad?

I replaced the display on the iMac and when I reconnected everything I noticed a flicker on the screen and that the display was not a bright as the previous one.

After a day or so the display went black and did not come back on.

I figured that there was a loose cable, but when I reopened the unit everything was secure. I powered up the unit as a test and found that the display flickered when it was lowered into place.

I soon realised that every time I moved the display up and down or touched the display power cable, the screen goes out.

I can’t see any damage to the connector on the motherboard. The display power cable end and sheath seem fine, no obvious damage.

Because I can only recreate the problem by touching the connector end of the cable I don’t think the display itself is bad. And like I said, the motherboard connector seems fine also.

Can I get a tv repair guy to swap this connector with the one from the old display, and should the spliced cable be soldered? Finally, would soldering cause any damage to the screen or would the heat dissipate before it can get to any of the components in the display?

Thanks for any help you can give.

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Can you post some pics of the connector and the cable end so we can see things 在已经存在的问题里加入图片

由 Dan 完成的 2020年9月12日

Hi @danj

Thanks for taking the time to respond. I added the photos you asked about.

I hope it helps.

由 Ted 完成的 2020年9月12日

Sorry Ted can't see anything here. Can you get in tighter and take some pics of the connector on the logic board as thats more likely the area that is damaged. The tighter and in focus you go the better!

由 Dan 完成的 2020年9月13日

Will do @danj

I will have to get the system back from my friend, he is using an external monitor to get him over a working hump. He is a writer and is behind on a few projects because of the display issues.

I will come back to you as soon as I can.

I was hoping that the cable was at fault and not the logic board.

What I will also do is attach the old display and see if the problem of the blacking out persist when we touch or flex that cable.

Cheers.

由 Ted 完成的 2020年9月14日

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Ted @tmtweb

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发帖于: 2020年9月24日

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Hi @danj

I was able to resolve the issue.

I discovered that the display power cable plugs into the base of the display in the bottom left and right-hand corners (I uploaded photos). Once I pulled back the tape and saw this, I swapped the cable from the bad display with the suspect cable from the replacement display.

There is no more flickering or black-outs and the screen is actually brighter.

Thanks again for your calm and measured advice.

Take care. And cheers.

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Can you post some pics of the connector and the cable end so we can see things 在已经存在的问题里加入图片 — Dan
Hi @danj

Thanks for taking the time to respond. I added the photos you asked about.

I hope it helps. — Ted
Sorry Ted can't see anything here. Can you get in tighter and take some pics of the connector on the logic board as thats more likely the area that is damaged. The tighter and in focus you go the better! — Dan
Will do @danj

I will have to get the system back from my friend, he is using an external monitor to get him over a working hump. He is a writer and is behind on a few projects because of the display issues.

I will come back to you as soon as I can.

I was hoping that the cable was at fault and not the logic board.

What I will also do is attach the old display and see if the problem of the blacking out persist when we touch or flex that cable.

Cheers. — Ted

iMac Intel 27" EMC 2639

Display power cable is bad?

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