Threaded Mode | Linear Mode

jebem · (This post was last modified: 06-15-2020 02:17 PM by jebem.)

(06-15-2020 09:54 AM)Ignatz Wrote: Thanks, GreyUser... a bit beyond my abilities, I'm afraid... the problem, however, was the dim segments, which kept getting dimmer with time until they almost weren't there at all. If I look at the display now, it looks as though the whole cycle is beginning to repeat itself...

That symptom looks like a bad supply voltage on the LCD display.
Just to eliminate possible causes, you could borrow an external 6 volt power supply to feed the calculator. Alternatively, use a battery holder for 4 X 1.5V penlight batteries.
Use a pair of cables with clips/alligators to apply the voltage to the calculator battery terminals.
Use good fresh 1.5 volt batteries (AA or AAA).
See the calculator behaviour by using it for a few days in these conditions.

If a known good power supply do not fix the issue, you may like to apply warm air into the LCD for a few minutes to see if it improves, by using an air dryer.
It is a long shot but it may improve the LCD display if the issue is caused by component degradation due to humidity.