Re: HP-80 Message #2 Posted by Viktor Toth on 21 Aug 2000, 12:44 a.m., in response to message #1 by shinji-ben
Ben,
I've seen a similar problem with an HP-55 a while back; the problem turned out to be a failed diode. On that machine, you could actually see the faintly lit segments flicker in response to keystrokes, so you could tell that the machine was still alive.
I have not actually discovered the failed diode until after I've desoldered, and replaced, both display driver chips (groan!)
I can provide more details in e-mail if you want.
Viktor
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