Hp91 with very dim display

[jjohnson873]

I've yet to see a dim display on the three HP-97's that I have acquired. If you have a new battery and the battery contact tabs are nice and shiny, that should eliminate the power issue. I would tend to doubt that the integrated circuits are bad that drive the display. I'll have to look at the display circuit since I'd bet that the HP-91 uses the same display drive circuit as the HP-97.
Does the printer work? If the printer works, then this shouldn't be a main power supply issue.
~ Jim J. ~