The LVDS cable that transfers data from the GPU to the internal monitor is affected by heat or damaged. What else could be the cause of the this? It's weird enoguht that half of the laptop is replaced but the issue is still there. The internal sensor reports a GPU temperature of at most 55☌. When the screen starts to flicker, none of the GPU sensors shows a high temperature. It is related to heat but not all about overheating: The problem only arises after a few hours of use, but I don't think there is an OVERheating issue. Detach the external monitors and the internal monitor starts to flicker again. I just have to detach the external monitors and/or enable automatic graphics switching, and the flickering disappears after a few seconds. Interestingly, when the screen flickers, switching back to the internal intel graphics card resolves the flickering. when the laptop is connected to the external display, OR if I disable the internal Intel graphics card in power settings). It's NOT an internal MONITOR issue: Screen flickering appears only after hours of use, when the GPU is enabled (i.e. It only happens for the internal monitor. Besides, when the internal monitor starts to flicker, the external monitors that use the same GPU (though, via USB-C) do not flicker. It's NOT a GPU issue: The GPU is attached to the logic board and is recently replaced, while the problem persists. Unfortunately, screen flickering re-appeared after receiving it back.
Despite that, they REPLACED the Logic Board, the Top Case, the I/O Board, and the battery, hoping that the issue will never show up again. Apple repair team could not reproduce the issue even after a video triage (because it only appears after some hours of use). I took the laptop to Apple genius bar and showed a recorded video of the issue. The external monitors have no issues at the same time and show the correct image. The flickering gets worse until the internal monitor turns into blank screen (even though it is technically ON, the backlight is working, but it shows just a black image). Since a couple of months ago, once the laptop is on GPU for a long time (at least 3-4 hours), the internal screen starts to flicker, like this:
I have a Macbook pro 2017 (15 inch, touchbar).
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