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Fluke 8840A/AF 8842A VFD Display Replacement

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bdunham7:
Yes, user AHOL from the Ukraine got a complete LED display custom-made and has released a viable replacement unit at a price I don't want to compete with.  The display is blue and isn't as large or bright as mine would have been, but it is available now and can be installed without any mainboard modification.  I can confirm that they work and look pretty decent.  The custom LED assembly is finished off beautifully, better than anything I've been able to make so far, even after I discovered laser-etchable black-on-clear acrylic.  He had a first version that didn't work as advertised, the second should be OK.  See this thread:

https://www.eevblog.com/forum/buysellwanted/ebay-led-display-module-fluke-8840a42a-(diy-kit)-replace-broken-damaged-vfd/msg3581681/#msg3581681

AHOL:
Hello bdunham7!

And a special thank you for paying attention to the problem on time. :-+

Kjo:
Very appropriate to bump this topic with new developments.
Hats off to AHOL for continuing to supply blue LED modules under his conditions.

I have been reselling these modules in the USA for some time by prewiring the module
for quicker & more reliable assembly. I have now reproduced the Fluke display PCB
with ENIG (electroless nickel immersion gold) for reliable switch contacts and to produce
a complete replacement for the Fluke part number 728873. This makes display repair a purely mechanical
operation.

Currently on eBay https://www.ebay.com/itm/155620309426
soon on my website.

nukie:
This is good. Im wonder why the designers didnt start off with LED displays in the first place then the future us don't need to suffer from these fading parts.

I am not old enough to know when the first led segment display was released but I know earlier dmm like the Keighley 196 sports the LED displays.

Kjo:
VFD offer design flexibility not easily achievable with discrete LED modules. (Even today). I think they were also brighter and offered fixed mixed color with different phosphors historically.
Graphic LCD &  OLED can now offer similar design flexibility.
I also think they this particular Itron display had some manufacturing issues that made its reliability and lifetime bell curves much broader for some reason, leading to  fading not seen in other VFD displays. I have seen microwave ovens just as old as Fluke 8840A meters with VFD displays that are still working brightly. But I have many more 8840A than microwave ovens, so the data is poor.

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