Chosen Solution
Hello there, The screen of my MacBook Pro 15” (Mid 2015) flickers in equal time intervals (about 3-4 per second). However, when I use the trackpad to move the mouse or the keyboard to type anything the flickering stops temporarily until not moved again. The weird thing is, when I connect an external monitor to the laptop, the flickering stops completely on both the Retina and the external monitor.
A reset of the laptop didn’t fix it. Also I tried capturing the flicker via screen capture, but that wasn’t recorded. So I believe it is not a software issue. I also reset the SMC, that didn’t help either. On the hardware side, everything looks fine on the inside of the laptop at first sight. My guess is that it must be the logic board. Since I have no profession in repairing laptops (especially MacBooks), I want to ask if anybody knows what might be damaged. A replacement mights be expensive to do.
Thank for your help in advance! EDIT: In safe mode everything seems to be fine. But that doesn’t correct the problem in normal mode.
Changing the display solved the issue. Very weird one…… you would think it’s something messed up on the logicboard but its not.
Your logic board needs deeper diagnostics. You either have a MUX logic or the Thunderbolt controller has a problem. This series has two Thunderbolt ports as well as a HDMI port in addition to the internal display. The video signal needs to be moved between the different outputs and in some cases the signal gets split across the different ports. This logic is quite complex and not easy to fix.
