27” Cinema Display Issue!

kevdon92

macrumors newbie
Original poster
Feb 3, 2015
20
3
I have a MiniDP 27” Cinema Display that I use with my MBP and it recently starting not working. When I first connect the MBP, it will generally work, but after closing the lid, the Cinema Display goes black. If I disconnect/reconnect the MiniDP, the MBP screen flashes as it sees the condition, but the Cinema display remains black. If I disconnect the power from the display and try again in an hour or so, the same thing happens. I’ve also now noticed a blue line running down the right edge of the monitor on black screens.


 

minik

macrumors 65816
Jun 25, 2007
1,247
62
Bellevue, WA
Probably the logic board/power supply. I have the 27-inch ACD with issue as well, brought it to Apple years ago and the Genius wasn't willing to repair it for me.
 

Fishrrman

macrumors P6
Feb 20, 2009
17,160
5,519
How -old- is this display?

If it's more than 6 years, I don't believe Apple will repair it any more.

Might be time to start thinking, "replacement".
 

JoshCalvetti

macrumors regular
Aug 30, 2018
119
80
Pittsburgh, PA
Yep, the early LED displays all seem to suffer from bad PSU or logic boards. I've had two of the 24" models die on me in the exact same way.

Meanwhile, all my old matte cinema displays still work flawlessly.
 

kevdon92

macrumors newbie
Original poster
Feb 3, 2015
20
3
It’s orettt old since it’s the MiniDisplayport version...has anybody had luck replacing the logic board?
 

kevdon92

macrumors newbie
Original poster
Feb 3, 2015
20
3
Yep, the early LED displays all seem to suffer from bad PSU or logic boards. I've had two of the 24" models die on me in the exact same way.

Meanwhile, all my old matte cinema displays still work flawlessly.
I took it apart and the logic board looks fine. All voltages are in line as well.
 

kevdon92

macrumors newbie
Original poster
Feb 3, 2015
20
3
It’ll work the first couple times if I have it disconnected from power for a while, but stops after closing the lid/connecting the DP cable multiple times
 

JoshCalvetti

macrumors regular
Aug 30, 2018
119
80
Pittsburgh, PA
yep, sounds like the same issue I had. My voltages were good too. I've heard some say it may be a few bad resistors on the logic board that make the display think there's no signal coming in, so even if the power lines are all good it just doesn't acknowledge anything being present.

Can you still see an image behind the glass? Mine got in the habit of killing the backlight, even though it was still sending a signal and I could see the pixels if I got a flashlight angled just right.
 

kevdon92

macrumors newbie
Original poster
Feb 3, 2015
20
3
yep, sounds like the same issue I had. My voltages were good too. I've heard some say it may be a few bad resistors on the logic board that make the display think there's no signal coming in, so even if the power lines are all good it just doesn't acknowledge anything being present.

Can you still see an image behind the glass? Mine got in the habit of killing the backlight, even though it was still sending a signal and I could see the pixels if I got a flashlight angled just right.
Nope, I get no backlight and no faint image when shining a flashlight either. The technician guide says to replace the LCD in that situation, but it doesn’t seem like the LCD would cause this issue over the PCB/Logic board
 

Fishrrman

macrumors P6
Feb 20, 2009
17,160
5,519
Is it -really- worth spending any more money on?
(money that could go into something new...)
 

steve217

macrumors regular
Nov 11, 2011
199
135
NC
I guess you know Fisherrman is right; if you need a reliable monitor, a quick google gets me lots of 27" choices - including this gem at BH for $179. Sure you don't get the camera (lousy but integrated) and the speakers, but you'll have a monitor again.

Are you that attached to the Cinema Display?

**EDIT - scratch that monitor suggestion. It was 1920x1080 not 2560x1440.
 
Last edited:

kevdon92

macrumors newbie
Original poster
Feb 3, 2015
20
3
I really only use it around 25% of the time, hence why I figured if a new logic fixed it for $65 it was worth it. I wouldn’t buy an entire new monitor
 

tpivette89

macrumors 6502
Jan 1, 2018
411
212
Newark, DE
I really only use it around 25% of the time, hence why I figured if a new logic fixed it for $65 it was worth it. I wouldn’t buy an entire new monitor
Stupid question, but you have the MagSafe plugged into the laptop, correct? The display won't switch to the monitor when closing the Macbook unless the MagSafe is connected.