HP 15C LCD Replacement

[DavidRicchetti]

    I have a vintage 15c that I still enjoy using. The LCD display is “bleeding” and has grown to the point that it obscures part of the readout. I’m attempting to replace the display and hoping to get some advise as well as to share my experience should someone have the same problem.

I’ve noodled around a bit and from what I gather there are a few different builds of the Voyager series calculators. I found a thread on this forum that recommends finding a replacement display from a donor calculator of the same build type. My 15c has a serial number starting 2328A… so I found a 12c with a serial number starting 2224A… with the same style battery connectors. How hard can it be?

Here’s a link to the thread… https://www.hpmuseum.org/forum/thread-29...er+display

I also found an article from 1982 showing the insides of an 11c of the same build type at valc.net here… https://www.hpmuseum.org/forum/thread-29...er+display

It looked like I would be able to swap-out the part called the “display module” and be done. No such luck. The so-called display module includes the processor so swapping a 12c display module will turn my 15c into a 12c. So I guess I need to remove the LCD display from the display module and swap out only that part. I may be in over my head!

I haven’t been able to find a detailed description of how that’s done so I’m hoping someone can point me in the right direction.

Many thanks!