Chosen Solution
The MacBook also makes a high-frequency ringing. Any ideas on what is wrong and if I can repair would be great!
From what you describe your T-CON board which is part of the display assembly has failed. Here’s the guide total it off: Retina MacBook 2015 Display Assembly Replacement Display assemblies Apple P/N’s - Silver: 661-02241, Gold: 661-02248, Space Grey: 661-02266
