Anyone got a Linn Kudos tuner? Question

Bought a dead Kudos tuner(no remote) and Linn was nice enough to supply schematics for the unsupported product. Fixed the dead aspect by troubleshooting the defective muting circuitry. The other issue is that the display reverts to blank but for two bars after a minute or so. Touching any function key restores the display and it stays up as long as you are doing key operations. My downloaded user manual makes no mention of this. Anyone? Otherwise reception seems fine.