I have a HP67 which I am sure is working OK! because it runs the diagnostic properly and accepts input and does simple arithmetic. The big problem is the display or lack of it!!.
I only get the middle segment correctly lit all the others are dull but with a magnifying glass I can tell that they are illuminated, but not bright enough.
Everthing is clean inside, and batteries are good (taken from a HP35/HP45 series).
I am suspecting it's the driver chips maybe just below the row of the LED displays, now one of these is a HP product and the other is an RCA chip. Does anybody out there know what my problem might be or how I can fix it, doing small delicate soldering jobs is OK! so if I can replace a chip that is no problem. Can I use the HP chip say from a HP25, HP29?? as according to the HP museum pages the technology in these series of machines is similar and the numbers on the HP chips are the same, (certainly the first number anyway). Thanks in advance for any help, Regards Richard.
HP67 display
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