Apple Thunderbolt Display 27-Inch black out

Thefrog

New member
Dear Forum,

Our 27 inch Thunderbolt Display becomes black after 1 minute, and then we cannot get it back to diplay any image anymore. On the MBA, we can still see the 27' in the monitor preferences and its related position with the MBA. I have read this topic from 2017 (A1407 Apple Thunderbolt Display 27-Inch Random black outs) but i have a question : the 27h inch is different from the imacs, and has 2 LEDs bars, one on the right, and one on the left. If the common issue with the connector that needs a resoldering is correct for our case, how do you explained that the 2 LEDs failed at the same time ? I'm afraid to enter into this difficult resoldering is this is not the answer to our issue.... Thanks for telling me our to diagnose our issue before puting effort randomly on each possible fix that is known. Kind regards.
 

2informaticos

Administrator
Staff member
First of all, welcome to the forum!

No matters which circuit fails.
It will trigger a common error flag.
 

Thefrog

New member
Thank you very much for the welcome :)
Ok, if I understood correctly, the failure is hardware and triggers a fw error that swiches off both backlights ?
KR
 

Thefrog

New member
We have a subcontractor for our electronic boards, he has very good people to solder the wires. This will be straight forward compare to unpacking the 2 leds I believe. Thanks again. BR
 

Thefrog

New member
Hello,

I have damaged the LED bar that was well soldered to the connector ... the other one was totallty free so I can confirm the failure. Then I had to amount everything. I went to ALIEXPRESS, all LEDs offered look to be refurbished. Is there any merchant that you know who has new LEDs ? ref is lgt2795. Thanks a lot.
 
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