Thread: dim VFD
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Default dim VFD


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...
Got this old 80's Panasonic VCR. Been in the family before I was even
born. It's VFD screen has gotten ultra dark, and fuzzy. Is there
anyway to fix this? The player still plays great, it's a top loader.


There are reasons that VFDs go dim, including the -25v (as low as -20v on
some displays, and over -30v on others) dropping due to poor capacitors in
the voltage multiplier that most designs use. However, by far the most
common cause of trouble, especially on something that age, is the VFD panel
itself going low emission. You could try checking the negative supply just
in case, and also giving the face of the display and the inside of the
window a good clean, as they collect a dust 'film' over the years. Other
than that, it's a case of live with it, or replace it with a shiny new PVR
....

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