I am a retired EE. I purchased my HP 49SX in 1993. After I retired in 2K I only used it to balance my checking account. But a few years ago I started doing that on-line and the calculator sat unused on top of my VCR.
A few months ago I got it out to do some math that I dould not do with the Windows calculator. When I tried to turn it on I got no display. I figures it was the batteries so I put new ones in and it still did not work.
Today in reading the manual it says the if you don;r get a display when you turn it on to hod the ON button down while repeatedly pressin the "+" key.
I tried this for an extended period. No sign of life in the display.
Do these LCD displays have a failure mode due to age or non-use?
Bob Macklin
Seattle, Wa.