Fluke 8020A LCD display

[IconicPCB]

Recently  ( a couple of weeks ago ) I had cause to take my old vintage 1980 Fluke 8020A DMM out into the field literally to work on a wood chipping machine.
The day was bright and warm, the job lasted about 5 hours and by end of day the LCD display had developed some random black spots.
I was wondering if there were any similar experiences with the display and whether this is going to progress and become detrimental.

[Fungus]

I was wondering if there were any similar experiences with the display

Yes. 8020A displays are very fragile. It's surprising that it lasted this long.

and whether this is going to progress and become detrimental.

Very probably.

[lowimpedance]

As Fungus said it is surprising it has not gone black already. All is not lost though you can with a little bit of work fit a new LCD and the meter will be good to go for many decades again.  .
See my first post on this forum about my 8020a and a very black display.

https://www.eevblog.com/forum/chat/recovery-of-an-old-fluke-8020a-with-a-bad-lcd/msg31154/#msg31154

And to find a nice write up on how to do it see Modemheads blog on how he did his.

[IconicPCB]

 

it is surprising it has not gone black already.

It has LED a sheltered existence

EDIT: thanks for the link