Are you sure the issue is the cable? While there where some reports of the Fn model also faced the cable issue the majority of the cases where the Touch Bar models. Does your displays image look like this when you tilt the display?
Or, it may just wink out. If you have odd colors or bars that is a different issue.
As far as replacing this cable I’ll worn you unless you are a brain surgeon it is by far the most difficult repair and you need to have built up the skill working on a ton of these displays.
The bottomline here, it’s just easier and less effort to just replace the display or find someone with the skills who has done a few. Even still there’s a sizable chance they will fail.
FYI - 2017 Fn MacBook FlexGate saga in Australia so while Apple continues to deny extended warranty on the 2017 systems which also use the exact same display assembly. Apple has quietly repaired many as warranty exceptions. But! You will need to go directly to an Apple Store and catch them on a good mood time/day mid morning on Tuesday appears to be the best window. Sadly, your window may have come to an end as with the new year this will likely be the last year of this system being serviced by Apple as it will be added to obsolete product list
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