I have an older HP 41CV (SN: 2123S11164) that has the main board from circa 1981 (it does NOT have any piggy backed chips). But nothing I do can make it come to life. I have done everything to try to make it work with no success. It worked for awhile and then one day I pressed the PRGM key and got a garbage display. From that moment it has degraded to the point that now the screen just remains totally blank. So, really my question is:
Are ALL the HP 41CV main processor boards interchangeable?
It seems like there were many, many versions of these processor boards that HP went through and I just want to know if I can pop in any old HP 41CV processor board and see if it will work.
Thanks!! Paul