I have a 27 inch Thunderbolt Display and was told by a repair guy to replace the fan and the issue would go away. I replaced the fan and the monitor def works longer than it did but now is cutting out again as-well. what else could be the problem?power supple or is it a video card? please advise. Thank you in advance.
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At first this looks like a loose connection within the display or to it. The winking out and back on would appear to be more power related with the displays backlight.
But! The point where I see a clean desktop
That decomposes to
We then see the display tries to resync
And then
This aims us to the T-CON board on the back of the display panel having issues!
I’m thinking you have a cold solder joint which is the issue or a cap is failing.
Now the fun part! Either you’ll need to reflow the components using a good flux (and solder) and hot air re-work station. Or, just replace the T-CON board or the display assembly if you can’t locate the needed discreet part. You might want to get a Grade-C display to salvage the T-CON board if your display is good otherwise.
As an example: 27” Thunderbolt Display LCD Panel, Apple P/N: 661-6028, LG #: LM270WQ1 (SD)(B3) - Grade-C
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Can you post a short vid showing us the transition from start to fuzzy so we can get a better idea Adding images to an existing question
из Dan
Posted the video. Thanks for your help. @danj
из omarhatab56