Hi
This issue can be fixed by soldering a new cable in place
However
That’s are 2 ways of doing this that are both extremely difficult
1)find the break in the cable that is already there(this one doesn’t last as long) and solder on a bit of new cable to what’s left
Here’s a video on it
[link|https://m.youtube.com/watch?v=ylGKFeNipS4|https://m.youtube.com/watch?v=ylGKFeNipS4|new_window=true]
2)take the display apart (this isn’t recommended because there is a fairly high chance you will break the LCD but is a more long term fix)
Here’s a video on it
[link|https://m.youtube.com/watch?v=bYtDVjYNxig|https://m.youtube.com/watch?v=bYtDVjYNxi|new_window=true]
As you can see neither option is what many would call easy but these are your only 2 options
As for the cable you can buy replacement ones on AliExpress for your model as all the newer retina MacBook use the same cable
Here’s a link to the part
https://a.aliexpress.com/_mt5D7Xm
Hopefully this helps
Any questions please ask
Thanks:-)