Tim Schwartz wrote:

Hello all,

I've seen several VFD's that have this issue, usually on the segments
that are rarely turned on, like a 12 digit calculator. One temporary
fix is to type in a ll "8" on the display, to light the greatest number
of segments and let it burn in that way for 24 hours. That usually
fixes the problem for a few months.

Thanks for the informations, sounds interesting. I have to make some
experiments on this display, either using the driver or making a temporary
circuit to light all segments. It's 16 digits (characters really) with
16 segments each.

Frank