Chosen Solution
The tilt display works in some positions, but in most - not.
If the problem is a damaged cable, which it may or may not be, you can get a replacement off eBay easily: https://www.ebay.com/itm/New-LCD-Flex-Ca…?
I found this video showing half of the cable replacement works. Does not appear to be easy: https://www.youtube.com/watch?v=8wpLLklS… Is is also not clear from the video if he ever managed to fix his camera.