HP 28C - horizontal bars across display ?



#2

This afternoon my HP 28C would no longer work!

(Had worked properly ever since I bought it 23 year ago, and still did so this morning.)

When I tried to switch it on, there were only two horizontal lines on the display.
http://www.stadler-christoph.de/P1030754.jpg

And I could no longer turn it off.

I tried the self tests, and they would still work, and the display was fine during these tests.

But afterwards there still were only these bars.

I replaced the batteries for a new set (gladly our company still has them in stock).
But this didn't help.

After putting the calculator away for a few hours I tried it again.
And now it works again properly - for the time being ...

Any idea what could be the problem ?


Possibly Related Threads...
Thread Author Replies Views Last Post
  HP-41C Transition to HP-28C book? Dan Grelinger 6 294 03-30-2013, 10:32 AM
Last Post: David Hayden
  Can the display for a HP32Sii be replaced with the display from another model? Bruce Larrabee 8 450 10-10-2012, 10:05 PM
Last Post: Luiz C. Vieira (Brazil)
  I really like the HP-28C keyboard Eddie W. Shore 13 553 06-28-2012, 04:31 PM
Last Post: Matt Agajanian
  2K==A lot of place for (HP-28C) stuff Matt Agajanian 4 233 05-21-2012, 09:59 PM
Last Post: Dominic Richens
  HP-42S - Time to drain a horizontal cylindrical tank Gerson W. Barbosa 2 151 03-03-2012, 11:38 AM
Last Post: Gerson W. Barbosa
  HP-28C ROM checksum addresses? Christoph Giesselink 0 107 07-25-2010, 08:25 PM
Last Post: Christoph Giesselink
  16 segment Led display would mimic a HP-41 display? Giuseppe Marullo 3 254 11-12-2009, 08:08 PM
Last Post: db (martinez, ca.)
  Is there any interest out there in Topcat tear-bars? Ignazio Cara (Italy) 0 126 04-10-2008, 06:52 AM
Last Post: Ignazio Cara (Italy)
  HP 28C/S battery doors Keith Beyer 0 96 04-04-2008, 05:22 PM
Last Post: Keith Beyer
  28C corrosion Vincze 8 380 08-10-2007, 06:35 PM
Last Post: allen

Forum Jump: