Bad screen or flex cable?
Hello!
Everything was working fine until one day i turned on the Mac and vertical coloured lines appear on the display.
Nothing change no matter the angle of the display.
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Sorry to say this is a classic case of a messed up display assembly. Here’s the needed partMacBook Pro 16" (2019) Display Assembly And here’s the guide MacBook Pro 16" 2019 Screen Replacement
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As a sanity check, you should plug in an external monitor. That will let you verify that it's a screen issue and not a GPU problem. Let us know what you see.
by Jerry Wheeler