Service Program—
https://www.apple.com/support/13-inch-macbook-pro-display-backlight-service/
All you can do is take it in and have it repaired.
At this time, there is no Service Program for this 15" issue of the projector cable, or the 2017 MBP.
Typically in the past if Apple does release a Service Program, they have offered a refund for out of pocket expense parts & labor for the exact issue covered.
Service Programs are triggered by the percentage of all MBP of this spec vs the number of failures documented.
We are not privy to this %, or have any more insight.
A repair ticket, your Apple Feedback—all are heading in the right direction to trigger this release.
Apple Feedback http://www.apple.com/feedback
A repair at your local AppleStore or AASP will generate a "service record" for the repair on your machine—and this is all you will need to qualify—if a Service Program is issued.
In or out of warranty you can get a free over the counter 'Apple Service Diagnostics' test /assessment
Make an appointment for a "hardware issue"—
https://www.apple.com/retail/geniusbar/
Outside USA
https://locate.apple.com/country
An alternative work-a-round for you is to connect to an external monitor if you can not afford the repair price.
