I assume this is a power supply issue with how other things being plugged in affect it, and I already tried replacing the logic board which did not fix it. Is there any other ideas on this, where I could look to repair on this power supply board? Thank you in advance!

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

⟐ Answer accepted July 31, 2024 at 18:42 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

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

⟐ Commented September 07, 2023 at 17:06 MST

⟐ Answered May 30, 2023 at 15:38 MST

I ordered spare pair of LED strips to LM270WQ1 (used ones only available), dismantled LCD panel, replaced both LED backlight strips successfully and mounted panel back.

To my surprise: when I finally connected it to computer, backlight is working without any issues on highest brightness setting but unfortunately the right upper corner has still washed colors/backlight leaking. In addition I can see some image persistence as well.

Any clues what is wrong? Anyone had similar issues?

⟐ Commented March 08, 2023 at 4:34 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

Many thanks.

⟐ Edited December 04, 2022 at 0:25 MST

⟐ Commented July 04, 2022 at 11:51 MST

⟐ Edited April 01, 2022 at 4:21 MST

⟐ Commented February 28, 2022 at 11:34 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

Do you sell replacement cables?

I found a replacement cable for the thunderbolt display, but I can't find a replacement cable for the led cinema display.

⟐ Answer edited October 25, 2021 at 19:28 MST

I recently was given a 27in Cinema Display from a customer of mine (from my actual job). He was about to throw it out because "it's just a black screen". I told him I'd take it off his hands. I was originally thinking it was just the back light that may be broken. However, after getting it home it seems like a possibly power supply issue. When the monitor is plugged into a power outlet it won't even power up a Macbook through the Magsafe cable. This is my first Apple display and it doesn't have a power button so I assume it just powers on when plugged in or when a device is connected to it?

For those of you out there that have repaired these, is the power supply a likely culprit? I'm getting 120v on the cable so that doesn't seem like an issue. I've read in a few places those can go bad.

Also, Macbook does not recognize a display connected. Thus another piece of evidence leading me to think the dang thing isn't even powering on.

⟐ Answered September 14, 2021 at 15:56 MST

Have you guys have the same issue in the past?

⟐ Commented July 12, 2021 at 19:08 MST

⟐ Answer edited February 01, 2023 at 22:29 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

⟐ Answered January 14, 2021 at 11:45 MST