Chosen Solution
Hi Ask Ifixit. My girlfriend’s MacBook Pro has some issues, as the screen is showing a scatter of different colours whenever it is turned on, making the internal screen useless. It looks different every time the lid is opened, and what could look like a GPU failure. When using an external monitor the internal screen and external screen both works completely normal. I have added pictures to illustrate how it looks. I ordered a new logic board as I was convinced that this would be the troublemaker, however the problem persists. Does someone have an idea of how to fix this issue?
Video Demonstration: https://youtu.be/jcFCM7lVTsQ
The output from the CPU graphics engine goes through a set of MUX logic gates which allow the signals to exit out of the two Thunderbolt 2 ports as well as the HDMI port and lastly the internal display. It’s something in this logic which is messing up the video signal.
What happens when you plug in a HDMI cable by its self into the port (nothing on the other end)? Update (11/04/2020) @thogerabildgaard - You’ll need to find someone who can fix your logic board or just replace it MacBook Pro 13" Retina Display Early 2015 Logic Board Replacement MacBook Pro 13" Logic Board - 2.7GHz i5 16GB, Apple P/N 661-02355MacBook Pro 13" Logic Board - 2.9GHz i5 16GB, Apple P/N 661-02357MacBook Pro 13" Logic Board - 3.1GHz i7 16GB, Apple P/N 661-02359
