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| big problem with glcd http://forum.lcdinfo.com/viewtopic.php?f=6&t=508 |
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| Author: | the_clou [ Sun Feb 01, 2004 19:30 ] |
| Post subject: | big problem with glcd |
Hey guys, i´ve got a big problem with my glcd! I´ve built the glcd with this plan: http://www.moddingtech.de/content.php?c ... &page=glcd first problem: I can´t see the text (graphic) but only the background light. What can I do to see the text (graphic)?? 
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| Author: | Henri [ Tue Feb 03, 2004 14:14 ] |
| Post subject: | |
First double check all your connections. Preferably with multimeter to make sure all solder joints are good. Also make sure everything is wired correctly. Then you could try changing your LPT port mode in BIOS. ECP/EPP usually works I believe but you can try them all. Then make sure you have correct settings in the program driving the display. |
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| Author: | rudi Grobler [ Wed Feb 04, 2004 8:32 ] |
| Post subject: | |
Also just make sure (with a multimeter) that the backlight voltage is correct... It should be something like -4V for the ks chip and -7.8V for the toshiba. Even if you see the backlight and it is not on the correct voltage you will usally see nothing. |
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| Author: | Henri [ Sun Feb 08, 2004 13:48 ] |
| Post subject: | |
rudi Grobler wrote: Also just make sure (with a multimeter) that the backlight voltage is correct...
I think there was a little typo here ? You probably meant the contrast voltage. But yes this is something I forgot the mention in my previous post and if the negative contrast voltage isn't working you don't get any picture. -4V or something like that is what the display here should have in the Vo pin(3). |
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