HP Forum Archive 19

[ Return to Index | Top of Index ]

HP-42S work-around for sticking to low contrast LCD problem Message #1 Posted by Lyuka on 22 Jan 2010, 2:40 p.m. Hi all. (It might be good news for DavidShenk.) I recently bought an HP-42S which has LCD contrast problem that seems to be identical to the case of the previous thread 'An HP-42S fix success, and a contrast problem'. I tried another way to generate the LCD bias voltage, and the work-around seems to work well so far. for more information - A work-around for sticking-to-low-contrast LCD problem of the HP-42S Regards, Lyuka Edit: URL to the image corrected. Edited: 1 Feb 2010, 5:03 p.m. after one or more responses were posted

OMG:Re: HP-42S work-around for sticking to low contrast LCD problem Message #2 Posted by Lyuka on 29 Jan 2010, 2:07 p.m., in response to message #1 by Lyuka OMG What I bought (at Yahoo JAPAN auction) and repaired is identical to DavidShenk's. SN=2942S30206 Quote: This is a version A with the flush display, S/N 2942S30206 and it passes it's self test. It's a small world.

Re: OMG:Re: HP-42S work-around for sticking to low contrast LCD problem Message #3 Posted by DavidShenk on 1 Feb 2010, 1:25 p.m., in response to message #2 by Lyuka I take a few days off checking the forum and when I come back you've got my calculator! I did not realize you were the buyer. I had reached a dead end and just couldn't do anything else with it. I'm glad you were able to find a fix. You always do a good job documenting what you do, and I think it will be a good help to others in the future. Dave

[ Return to Index | Top of Index ]

Go back to the main exhibit hall