The failure of these vacuum fluorescent displays is apparently quite common in this generation of equipment, because these displays can in fact wear out. Another reason is that the "high voltage" needed to drive the display can often fail.
In the first case, you need to replace the display, which is not easy. However, in the seconds instance, repairing a supply failure can be quite straight-forward.
Which case do I have here? We'll see.
FYI, lots of inspiration and ideas for this repair is owed to 12voltvids, especially the following video:

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You can now support the channel:
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Full info on this model:
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DIY TEST GEAR: The title says it all:
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RESTORATION BUILDING BLOCKS: A series of videos showing detailed steps used the restoration process of tube equipment:
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HowTo's: Various videos on some simple techniques and projects:
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See also playlists on some other completed restoration projects.

PHILIPS BX750A:
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TELEFUNKEN OPUS 2114:
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SABA UW-175-Z 3D:
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GRUNDIG 1070:
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SCHAUB-LORENZ GOLDY 58 type 3020:
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BUSH VHF64:
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GRUNDIG 3060A:
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TELEFUNKEN OPERETTE 8:
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GRAETZ SUPER 171W:
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LOEWE-OPTA MAGNET 3737W:
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BRAUN ATELIER 3:
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LOEWE-OPTA TRUXA STEREO 4741W:
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GRAETZ COMEDIA 616:
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SABA FREIBURG W2:
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GRAETZ MUSICA 4R417:
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CAPACITOR LEAKAGE TESTER:
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