HP41-CV woke up dead

[hossnerbiz]

After 40 years of daily driving, my trusty HP broke.  After some checking, I determined it is the display that isn't working - it is blank.  I confirmed that the CPU etc is working by blindly keying the BEEP command, which resulted in the familiar 4 tone chime.  

Anyone here with experience with these calculators?  What typically goes bad?  The display driver?  The display?  Cracked solder joints?  I assume I might need a parts unit and a tricky remove and replace  - with another 40 year-old part.  Better to just get a working unit and eulogize the old one?

Thanks in advance!

Steve in OR

[Adam Jones]

You may have a bad solder joint between the main keyboard PCB and the display PCB. 

Adam Jones

Sent from my mobile

On Jun 5, 2024, at 1:23 PM, 'hossnerbiz' via OldCalculatorForum <oldcalcul...@googlegroups.com> wrote:

After 40 years of daily driving, my trusty HP broke.  After some checking, I determined it is the display that isn't working - it is blank.  I confirmed that the CPU etc is working by blindly keying the BEEP command, which resulted in the familiar 4 tone chime.  

Anyone here with experience with these calculators?  What typically goes bad?  The display driver?  The display?  Cracked solder joints?  I assume I might need a parts unit and a tricky remove and replace  - with another 40 year-old part.  Better to just get a working unit and eulogize the old one?

Thanks in advance!

Steve in OR

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[hossnerbiz]

Adam - 

I'm back in business!

I re-flowed all the solder joints, both ends of the connector fingers.  Afterward, the calculator sputtered to life and works!   Even after about a week with no battery, I did not suffer Memory Lost.  Yay!

Thanks for the encouragement.  
Steve in OR