The Museum of HP Calculators

HP Forum Archive 15

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HP 41CV
Message #1 Posted by sdbloom on 29 Sept 2005, 4:43 p.m.

The display on my HP41CV goes on only when I hit the shift button. It goes off when I release the shift button. Otherwise it seems to work OK. Any ideas?

      
Re: HP 41CV
Message #2 Posted by David Smith on 30 Sept 2005, 5:35 p.m.,
in response to message #1 by sdbloom

This is a rather common problem. Usually caused by old solder flux or other gunk (often invisible) on the display module, connector pins, or the CPU board. Open the machine and clean everything with 91%+ isopropyl alcohol. Keep the alcohol off the display lens or it will leave white spots (that can be polished off).

If this does not fix it, the LCD module is probably bad.

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