Re: HP 41CX shut down Message #2 Posted by Ed Martin on 12 Feb 2003, 11:04 p.m., in response to message #1 by Brent
Brent,
I had the same problem with my 41CX (it was a fullnut). It would shut off in just under 15 seconds after the last keypress.
I dug very deeply into this but was never able to really nail down the solution exactly. The problem is related to the "sleep" mode of the calculator, which is controlled by the LCD display driver (trust me). I have seen several other people post with the identical problem, so it must be an inherent weakness of the design.
One quick and dirty solution is to XEQ "ON" when you first turn on the calc. Of course, you need to remember to turn it off, or you could use up a bunch of N cell batteries.
The more complex solution, and one which unfortunately led to the demise of my CX (sob) is to try to repair the hardware problem creating the "quick off". If you are comfortable opening the calculator, I would recommend looking at the metal tabs which connect the LCD display driver to the main board. Use a sharp pointed object (like a dentist's pick) and a magnifying glass to see if any of the connections have come loose. If so, repair them with a fine tipped soldering iron. Just do a better job than I did .... I apparently damaged something in my effort to find the problem.
Good luck
- Ed
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