I’ve repaired +20 BL5K lately and my experience is that the original display ribbon will fail at some point.
There is a guy in Struer I use my self who can replace the ribbon. PM me for contact details if you go down that route.
But if you chooses not to I think that Beolover has an instruction with a 3D printed fixture.
For recap of the IR PCB, there is a guide from Leslie Nelwan at the Beoworld archive showing which caps there needs to be replaced.
https://archivedforum2.beoworld.org/forums/p/9016/89901.aspx
Look a little more than half way down.
For reattach the display I use double-sided tape from RS Component after a good clean to remove the old glue.
https://dk.rs-online.com/web/p/skumtape-dobbeltsidet/1612919?gb=s
The artefact on the display is not fixable. At least for now.
In according to the service manual the only thing there can be ajusted is the contrast of the display.
Hope the above gives you some help and mybe you could get some inspiration for this:
https://forum.beoworld.org/forums/topic/beolink-5000-finally-a-solution/
/steffen
Location: Hvidovre, Denmark
My B&O Icons:
