Chosen Solution
Hi, I just replaced the broken display (dropped) to a new one and the result was as in the photo.
The display with a wide black band at the left center…. I checked again the connectors by disconnecting and reconnecting again but no change. An external display shows perfectly and therefore no issue on GPU, if I understand well. I also called the shop where I bought the display (Ali Express), but they said the display was passed their inspection correctly. I will try to replace the flat display cable, but anything else should I do? Any suggestion please?
Ouch! Not good ;-{ You need a new display assembly as something heavy was pressed on the lower edge of the lid or the system got a good bang along it. Basically, the vertical data lines within the LCD got damaged which tells the black areas pixels to light. Here’s the needed pat MacBook Pro 13" Retina (Late 2016-2017) Display Assembly and the guide to put it in MacBook Pro 13" Function Keys 2017 Display Assembly Replacement
based what it is showed, I think, it is display issue. GPU for sure no because usually all screen will do something. Could be display cable also. But if you bought assembly they come with cable
