Isn’t that an LCD in the 34460A?? Should last nearly forever.
The 34440A's I'm familiar with all have VFD's, not OLED's.
There is no 34440A. Are you thinking the 34410A? Either way, that’s not the same as the 34460A.
I checked, the 34460A (still part of Keysight’s latest crop) is an LCD, as I thought:
https://literature.cdn.keysight.com/litweb/pdf/5991-1983EN.pdf?id=2318052(It says it’s a 4.3” TFT with LED backlight.)
Isn’t that an LCD in the 34460A?? Should last nearly forever.
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LCDs do fail. Newer models are quite a better than earlier ones that had problems with defective seals, spacers, and polarizers. As an example older Fluke DMMs are notorious for bad displays.
[...]
If you want a long lived or serviceable display in your test equipment look for displays that used standard 7-segment LEDs... followed by monochrome LCDs (but check the interwebz to make sure the model does not have some well known LCD problems). Oddly, nixie tube displays seem to hold up quite well and replacement tubes can still be found.
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But standard LCD
modules like 1602’s and most color TFTs are so standardized that replacements should be available for decades to come.
And while
early LCDs did have troubles like you mention, I don’t think those have
ever been common in TFTs, since by the time those came along, LCDs were already mature technology. Look at early 1990s laptops: their displays still work just fine.
The person I was replying to (while on the go, hence not doing extensive googling) seemed to be worried about the LCD in the 34460A. I think there’s absolutely nothing to worry about. I don’t think it’s likely to fail, and even if it did, I suspect it’s fairly easy to find a replacement that will work.