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Screen Flickers Caused by Overheating?

I've been using my Apple Thunderbolt Display for about three years now, and recently it's been giving off these flickers/flashes after running for about 10-20min (around when the heat exhaust from the lower left side gets decently hot to the touch). I replaced the fan inside thinking it was an issue with that but the problem did not go away. I've also tried additional external cooling with extra fans but that did not help. My suspicion is that the components themselves are creating more heat than they should but I don't honestly know. It could also be a software thing, which might be a problem for me as I use it as a monitor for a Windows PC. I've attached a video link here: https://youtu.be/QdNNoDSd99U. It's easy to miss it on the video but it's far more noticeable in-person. Any advice is welcome!

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put it off for 5 minutes

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Can you explain a bit more what you mean?

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@dg179 I'd focus on the components heating up. this could simply be a failing capacitor on your power board. This is where some kind of thermal camera will come in handy. Also, try some freeze spray and try different areas of high power consumption while the screen flickers. If the flickering stops or decreases you know where to check closer. I know that this will not be easy to do but with a little bit of ingenuity, it can be accomplished. You got this!

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Sadly the video doesn’t really capture your issue. I could see a very short upswing in brightness looking at the blue bottom edge.

So let’s look at this from the displays perspective… you have a LCD panel which is illuminated by an LED light bar which is dispersed within a cavity and diffusion sheets so the entire panel area gets the same amount of light.

So if we trace back the light via the LEDs we have a circuit which filters and adjusts the voltage (brightness) which was in turn got its power from the power supply. And the power supply got its power from your house AC outlet.

So we need to break down this pathway into a smaller area for deeper diagnostics. So the easiest way is to check the AC outlet using a simple gage or DVM to validate the outlet is properly wired and grounded. Next is to isolate the outlet circuit so only the system and display are using it disconnect and remove anything that’s sharing this outlet and the other lights/outlets that share this circuit feed by fuse/circuit breaker. With that done is the problem still present?

The next test is running a good thermal monitoring app on the system, this then gets into what OS the system is running. You stated Windows but is this a Mac systems running Windows or a Dell or other Windows system? Remember this displays connection is dual use! Thunderbolt on a Mac via a Thunderbolt port or DisplayPort via the same connector (mDP) which can also be a factor.

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Yes, this is one of the factors why it flickers.

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I am using a Razer Blade Stealth running Windows 11, it connects to the monitor like so: Razer Blade Stealth --> Cable Matters Aluminum Thunderbolt 3 Dock [1] --> Thunderbolt 3 to Thunderbolt 2 Adapter [2] w/ Thunderbolt 2 cable --> Apple Thunderbolt Display

[1] https://www.cablematters.com/pc-887-133-...

[2] https://www.cablematters.com/pc-800-131-...

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@dg179 - You don't need to dock, remember this connection is mDP not TB! The confusion is the USB-C connection Vs the TB connection (mDP here) so you do need to convert the physical but the signals are still DP between!

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@danj Yes, you care correct, I don't need to dock I do though because if I feed the monitor directly into the laptop I won't be able to charge it, as it only has one Thunderbolt 3 port and it's also its charging port. That being said, I've tested this issue without the dock and it still persists, so I know at least the issue does not lie with the dock. I'm going to test out my outlet once I get hold of a multimeter

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@dg179 - What time of the day do you notice it?

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David G estará eternamente agradecido.
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