HP Forum Archive 19

[ Return to Index | Top of Index ]

Faint HP-11 LCD Message #1 Posted by aj04062 on 23 Apr 2010, 12:13 p.m. Any solutions for a faint LCD on these calculators? Edited: 24 Apr 2010, 2:53 p.m. after one or more responses were posted

Re: Faint HP-11 LCD Message #2 Posted by Ignazio Cara (Italy) on 23 Apr 2010, 2:32 p.m., in response to message #1 by aj04062 We can't see the picture! Ignazio

Re: Faint HP-11 LCD Message #3 Posted by Martin Pinckney on 23 Apr 2010, 2:56 p.m., in response to message #2 by Ignazio Cara (Italy) Ignazio, try right-clicking on the icon, and select 'view image'. Works for me.

Re: Faint HP-11 LCD Message #4 Posted by aj04062 on 23 Apr 2010, 7:19 p.m., in response to message #3 by Martin Pinckney I've tried to post pictures from my picasa site and they don't come through. Any suggestions? Edited: 23 Apr 2010, 7:20 p.m.

Re: Faint HP-11 LCD Message #5 Posted by cm41u on 23 Apr 2010, 8:55 p.m., in response to message #4 by aj04062 It looks like you're posting a link to a web page, not an image. You need the link to the actual image which is: http://lh3.ggpht.com/_32YBZSrfeUs/S9HHuUqIMaI/AAAAAAAAAi0/vv7eRZy37Gk/Cal.jpg which you can then imbed with the image command like this:

Re: Faint HP-11 LCD Message #6 Posted by Gerson W. Barbosa on 24 Apr 2010, 10:20 p.m., in response to message #1 by aj04062 Same problem here, but in a lesser degree: Lyuka has suggested in a former thread LCD contrast problems might be due to a faulty tantalum capacitor, among other things, but I haven't checked this out as I got used to the slightly low contrast on this one. http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv019.cgi?read=160283

Re: Faint HP-11 LCD Message #7 Posted by Lyuka on 25 Apr 2010, 11:16 a.m., in response to message #6 by Gerson W. Barbosa Hi, Gerson The cause of the low contrast LCD of the 42s was found to be broken switching transistor for LCD bias generator in the chip. for more information : A work-around for sticking-to-low-contrast LCD problem of the HP-42S However this won't apply to the HP-11C's case. Regards, Lyuka

Re: Faint HP-11 LCD Message #8 Posted by Gerson W. Barbosa on 25 Apr 2010, 12:35 p.m., in response to message #7 by Lyuka Hello Lyuka, That particular HP-15C (SN 2905B29505) was bought brand new in 1989 by a collector in São Paulo and kept unused for more thant fifteen years before he eventually sold it to me. About one year earlier, another collector in São Paulo was lucky enough to find a new-in-box HP-15C in a small store, forgotten in a upper shelf where it had been kept since 1989. He sent me some pictures of it, but I cannot find them anymore. Incidentally, his only complain was about the dim display. From these two samples I cannot infer whether this was due to the long time the calculators had been kept unusued or to a problem on those final run units. Do you have any idea? Regards, Gerson.

[ Return to Index | Top of Index ]

Go back to the main exhibit hall