We've seen a lot of these displays fail more recently. The issue is, there isn't really a reliable source for the parts of these displays. Apple class all the cinema display models as 'Vintage' now (even the thunderbolt 27" model), so the only option is after market sources, which dry up pretty quickly...
That being said, if you shine a torch on the display and can see a faint image, and the mac can see the external display as being connected (check under the 'Graphics/Display' tap of the system profiler, or system information panel. it should show up showing the display as being connected with its resolution noted, even if the external display is blank)
if that is the case, then it is more likely to be one of 3 things. The LCD having failed, the internal logic board or the PSU. The all in one cable does wear and fail on occasion, but in our experience, this causes intermittent connection issues, so it wouldn't be showing up in the system information panel, and wouldn't be showing a faint image.
Basically, 2 feeds go to the display, so its helpful to know which has failed. You get backlight feed, and you get image. If you can see a faint image, then your backlight feed has failed.
Same goes for your display @schwinny. It is likely that your backlight feed is beginning to fail, so it will need tracing, but its a separate issue to the image feed, which is unaffected from what you've noted in your symptoms.
I hope this helps.
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14 Commenti
Hi everybody.
i have the same bug and i looking for a resolution.
I have black screen but with a magnate torch, i see the screen make a very light display.
The sound is ok. USB also.
my mac recognize the screen.
when i plug the monitor, everything is ok for 1sc and after... black screen.
sometinmes, everything are ok for few days.
Have you a idea ?
PS: excuse my bad english, my mother language is french ;)
da Jeremy
i have the same issue
No image but sound only
any help ?
da mohamed aly
replace the backlight LED stripes of the LG panel, you can find them on aliexpress
da Thomas Binderhofer
For what it's worth I have a similar issue except that its a black screen with sound when I plug in a PC to the cinema display. The way I resolve it is by unplugging the monitor thunderbolt cable from the PC and plugging it into my macbook pro for a brief second. Once the mac registers with the cinema display I can plug it back into the PC and the PC connects just fine. Super odd but works every time.
da Charlie
Charlie Charping
I have identical issue.. with Cinema Display going black for no reason from my iMac and it does turn back on and works fine connected to a MacBook and then works on iMac after as per your fix. But it does go black again shortly.. Any clue what is happening here? Would obviously like to find a permanent solution
da faustas kazlauskas
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