Hello Old Friend

[mfleming]

(04-13-2017 06:35 PM)Gerson W. Barbosa Wrote:  My second HP-48GX and my HP-200LX are unusable due to dark spots. I had already replaced the screen of the latter because of the same reason.

I have an old rubber-key 49G relegated to the shop that began to develop a dark spot on the screen. I kept the calculator in a case with a magnetic clasp on the front, and I noticed the spot was roughly beneath the magnet. Thinking that might be the cause of the spot, I started returning the calculator to the case facing backwards. Sure enough, after a few months the spot went away.

Anyone hear of magnetic fields affecting the liquid crystal material of a display?
~Mark