HP-33S Display Quirk


Hi all.

Yesterday, while I was using my 33S, I noticed a little speck (dust) on the display. So, as I removed it by lightly touching my finger to the display, like a sponge, I could remove the spec. As I did this, by the lit RPN annunciator, a black smudge (like ink or LCD material) appeared and dissipated.

Has anyone experienced this? What is it and what does it mean?


All LCDs do that.



As I am more accustomed to cleaning dust off hard displays like a 25C, 32E, 67, I am not that familiar with how flexible the covering of LCD displays is. Plus, with all the chatter about the '35S Bug List', I just thought the 33S & 35S had design flaws too. Thanks for the clarification.

Edited: 14 May 2012, 11:43 p.m.


Some LCDs are covered wth glass or thick plastic "windows" physically separated from the lcd. In these cases, you won't get the "smudge" effect.

You can get the "smudge" on your laptop, too, if you have one of the lightweight flexible screens.


The 15C LE does this too.

Possibly Related Threads...
Thread Author Replies Views Last Post
  HP-32S/33S/35S emulator with Stack Overflow sensing/Stack display x34 3 1,228 10-26-2012, 04:56 PM
Last Post: x34
  Can the display for a HP32Sii be replaced with the display from another model? Bruce Larrabee 8 2,231 10-10-2012, 10:05 PM
Last Post: Luiz C. Vieira (Brazil)
  Is this right? 33s ALG mode quirk Matt Agajanian 6 1,535 03-16-2012, 12:45 PM
Last Post: bill platt
  Old Datamath quirk: anyone remember? Glenn Shields 6 1,569 10-09-2011, 10:56 PM
Last Post: David Ramsey
  34s work-around for 41c quirk Gene Wright 6 1,464 08-12-2011, 07:07 PM
Last Post: Paul Dale
  16 segment Led display would mimic a HP-41 display? Giuseppe Marullo 3 1,278 11-12-2009, 08:08 PM
Last Post: db (martinez, ca.)
  HP 33s display Peter Klein 6 1,396 09-02-2009, 09:19 PM
Last Post: Peter Klein
  HP35s Program Memory Quirk Thomas Chrapkiewicz 45 6,956 05-18-2009, 07:55 AM
Last Post: Bart (UK)
  Integration Times "Old" 33s vs "New" 33s John Smitherman 21 3,779 12-14-2005, 12:04 AM
Last Post: Karl Schneider
  Latest 33s Display is Indeed Improved Paul Brogger 155 22,827 11-11-2005, 03:42 PM
Last Post: bill platt

Forum Jump: