⟐ Answer edited February 01, 2023 at 22:29 MST

All blogs read Replace one of the following:

•Power Supply

• Logic Board

• LCD Panel

Since Im getting power Ive ruled out the power supply.

Next, on to the Logic board.

What needs to be checked? Capacitors?

Please confirm the most likey suspects.

Thanks

⟐ Commented October 20, 2025 at 11:55 MST

Problem is that after putting the foot back on, I cannot get it to go back upright. There is some kind of latch preventing the stand from going upright and the little plastic card that came with the VESA kit does nothing to release this latch.

Getting the foot off was easy but getting it back on is proving to be very difficult. Any tips on how to get the stand to release back to it's upright position?

⟐ Commented December 30, 2022 at 19:29 MST

With backlight set to low, it's not too audible. Up the backlight to the max, and the buzzing is now very loud.

When I removed the front panel, to check which component make the buzzing, it appears to be behind the LCD panels. I didn't go further.

Where could I get the required parts?

Any ideas?

Thanks in advance

⟐ Commented June 11, 2019 at 0:07 MST

⟐ Answer accepted October 05, 2016 at 14:14 MST

How to replace the all in one cable? I found the part here: http://www.ebay.fr/itm/New-APPLE-All-In-...

I need the guide to open it and replace this cable?

Thank you,

⟐ Commented April 21, 2024 at 0:35 MST

I tested it on a macbook that is working with another cinema display, but nothing happened. I opened up the broken display and reattached the cable connecting to the function port on the logic board. After trying it again, it would flicker and I would see my desktop for a split second before the screen goes black.

The display is detected, is able to charge my laptop, and the rear USB ports are also working. The display will flash and show my desktop every time I reconnect the mini dp.

Any thoughts on what could be faulty here?

⟐ Commented January 24, 2022 at 15:45 MST

⟐ Commented January 20, 2019 at 6:19 MST

my Apple Cinema Display 27" (no more warranty) got some problems with its backlight and I'm not quite sure whether its the logic board or the power supply..

It works for a few minutes, but than it randomly turns down the backlight of the LCD. There is still a picture, that can be seen e.g. at direct sunlight. So the LCD itself should work fine!

I can speed up this more or less random process by in- or decreasing the brightness.

If i disconnect the display from power and reconnect it, it works again for some minutes. Then, same procedure...

There is also a buzzing noise coming from "inside" which gets louder the brighter the LCD is but doesn't really stop when the backlight turned down again.

For me this buzzing noise sounds like a damaged transformer or some other power supply problems... but I'm not sure...

What I'm sure is, that these two problems have the same source and hopefully will have the same solution.

I already tried the things listed in the Apple Technician Guide and the ones on the internet...

What do you think? I thought I'll ask you for some advice befor ordering some parts like new power supply or new logicboard..

Thank you! :-)

Alright guys... I replaced to PSU. Nothing changed..

⟐ Answered October 01, 2015 at 5:58 MST

⟐ Commented July 04, 2022 at 11:51 MST

⟐ Commented September 07, 2023 at 17:06 MST

Have you guys have the same issue in the past?

⟐ Commented July 12, 2021 at 19:08 MST

⟐ Commented April 28, 2019 at 17:01 MST

⟐ Answered May 30, 2023 at 15:38 MST

Would anyone know where I could find a video on how to replace a power supply on an Apple 27in Cinema Display? or some guide on how to do this?

Thanks, Kelvin

⟐ Answer deleted April 13, 2021 at 12:10 MST

I need LM270WQ1(SD)(B1) but do other panels work too? Like the ones for the 27" iMac?

Btw, it's not the Thunderbolt-version.

Thanks!

⟐ Commented April 20, 2018 at 8:44 MST

⟐ Commented June 06, 2020 at 5:19 MST

Today I noticed faint pixel thick lines about inch from each other all over the screen. Clearly visible on dark backgrounds when MacOS is in DarkMode, but almost impossible to see if screen is completely black or white.

Screen on macbook is fine. I played with different resolutions, reset PRAM, rebooted machine, tried different thunderbolt connectors…

So far, if I’m far enough from the screen it’s not bothering me much. But just wanted to know is this is something I need to worry about? Can the condition of the screen deteriorate?

I made a photo of the screen, not sure how visible issue will be:

Thanks in advance!

⟐ Commented April 11, 2024 at 5:19 MST

From your advice, I will now test the DC voltage to the backlight. But are you saying that if it is getting proper voltage the only fix left is the entire LCD panel and the backlight can't be replaced independently?

Thanks for the great step by step troubleshooting advice!

⟐ Answered September 20, 2015 at 4:50 MST

⟐ Commented October 29, 2014 at 23:52 MST