If you want to bid on the dead display player, here are the DigiKey numbers for the replacement parts:

3M1120-ND 20-pin 2mm header gold (need one of these)
111626-4 20-pin 2mm recepticle for 1mm ribbon cable (need two of these)

You'll also need some 20 conductor 1mm ribbon cable, which can be cut from the same stock as for the Empeg's HD cables.

EDIT:
To do the repair, first remove the old connector from the displayboard:
- rip off the ribbon cable
- use very fine snips to chew away the black plastic a little at a time
- desolder the pins one at a time
- solder suck the holes clean (may need to add some solder first)
- solder in the new header
- cut & crimp a new cable with identical connectors on each end.
- plug it all together and Bob's your uncle!

Cheers