HP-41C Tall Keys Strange ON Behavior



#2

Any theory as to why a HP-41C would turn on with almost any key but not with the ON button? I can turn it off (I think the display just goes blank as it will record keystrokes), but ON will not turn it on.

I just swapped the LCD from a 2-3 year newer CV.

The only way I can get MEMORY LOST is to short out the battery terminals.


#3

This time I must tell I never heard of it...

If I have a calculator with this behavior I'd check the LCD soldering points and the connection between the MBoard and the keyboard (the zebra connectors).

Success!

Luiz (Brazil)

#4

As Luiz wrote, please check the contacts.

Another idea: The LCD driver of the newer CV may not be fully compatible to the old main board, see notes on the Systemyde 41CL when using in an old 41C with square LCD controller cases.

HTH

Ray


#5

I don't think it's the display driver as the SN is late enough. I've cleaned the zebra and board contacts once. I guess I'll look at them again.

I'll try the board in another unit to see if that changes anything.


Possibly Related Threads...
Thread Author Replies Views Last Post
  Broken keys on HP Prime? Tarcisi C 0 172 12-10-2013, 05:59 PM
Last Post: Tarcisi C
  Strange HP 25 Problem (Repair) Onur Ilkorur 5 351 12-06-2013, 05:13 PM
Last Post: Onur Ilkorur
  Strange Battery Icon during updaate of Prime Firmware. Harold A Climer 7 485 12-05-2013, 04:40 PM
Last Post: Michael de Estrada
  HP 50g switching two keys in the user keyboard Sean Freeman 9 545 12-05-2013, 11:44 AM
Last Post: Mark Puscas
  HP PRIME : strange behavior when trying user key capability Damien 12 594 11-03-2013, 11:02 AM
Last Post: Joe Horn
  [HP-Prime] off-center [0], ... [9] num keys CompSystems 1 188 10-18-2013, 10:44 PM
Last Post: Han
  HP Prime - Home and CAS keys BruceH 0 133 10-15-2013, 07:19 PM
Last Post: BruceH
  HP Prime function APP - Strange limitation ! :o( dg1969 2 238 10-04-2013, 12:10 PM
Last Post: dg1969
  Prime formatting behavior Camille 0 113 09-28-2013, 05:37 PM
Last Post: Camille
  HP Prime Tip: Setting Up User Keys Eddie W. Shore 2 228 09-27-2013, 09:53 PM
Last Post: Eddie W. Shore

Forum Jump: