OT: Argh--my old faithful HP16C is failing!

Paul Berger phb.hfx at gmail.com
Wed Dec 6 16:51:44 CST 2017

Ok I am guessing you have figured out how to take the back off? (screws 
under the rubber feet) with the calculator upside down and the display 
away from you there is a connector at the top right that connects the 
keyboard to the electronics on the back of the display carefully  lift 
that  flexible cable over the posts.  With the back off the display 
module is big held in by four foam blocks that fit over the plastic 
posts, gently lift the display module up and they will come with it.  
The part you are going to change is just the glass of the display it is 
held in place by a metal frame that has tabs folded over.  You can try 
to save the thin plastic anti static wrap but it is held on with the 
glue from hell so you will probably end up cutting some of it away.  The 
glass part of the display is connected to the circuit board under it by 
elastomer block, keep them clean any debris on them will probably result 
in a segment that does not work.  Swap the refold the tabs on the metal 
frame and reassemble.  You will note that on inside of the back of the 
display there are hollow posts that fit over post at the keyboard 
connector and display to test it before putting it all back together, 
put batteries in, and hold the keyboard connector in place with your finger.


On 2017-12-06 6:11 PM, Chuck Guzis via cctalk wrote:
> On 12/06/2017 01:22 PM, Paul Berger via cctalk wrote:
>> I just looked back at the archives of the hpmuseum.org site and the
>> donor 12C that the display came from for the 16C I repaired for another
>> MoHPC member had a serial number that began with 2224A and was the
>> version with the innards wrapped in black plastic like your 16C.
> My lovely wife remembered that she had a 12C when she was taking some
> accounting classes (part of an unused Master of Public Administration
> degree she has).  We found it--still in its old box, serial number
> 2316A...   We're in business.
> Now, how does one remove the display from one board and transplant it
> the other?  Is it as simple as bending back the LCD frame tabs?
> Thanks,
> Chuck

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