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KS0108 Contrast problem
http://forum.lcdinfo.com/viewtopic.php?f=6&t=1842		 Page 1 of 1
Author:  badchicken [ Sat Nov 18, 2006 20:10 ]
Post subject:  KS0108 Contrast problem
Hello,

I recently bought a 128*64 KS0108 lcd from Sureelectronics (specs : http://www.sure-electronics.net/englishsite/lcdmodule/128x64.pdf). I connected it with this schematics : http://www.skippari.net/lcd/displaytech12864a.gif, everything is ok except the contrast, which is very very weak.

Some pictures :
With LcdStudio, low contrast
Image

Wiring (same problem with 10k potentiometer)
Image

Pc is booting, I plug in USB and // cable and the contrast seems to be ok :?
Image


Any help would be great :D
Thanks for your answers
Author:  One~Zero [ Sun Nov 19, 2006 16:03 ]
Post subject: 
So it seems the contrast is looking ok in the last picture....what is the problem you are having now?
Also, if the screen shows like one half is on the opposite side, switch the wiring between your CS1 and CS2.
Author:  badchicken [ Mon Nov 20, 2006 13:29 ]
Post subject: 
To take the last picture, I plug in USB and // when my computer was booting (bios screen), so I guess there is no/wrong data, which explain the split screen.
Then when windows starts, all pixels turn off and when I start LcdStudio, the contrast is weak (pict 1) :?
Author:  One~Zero [ Mon Nov 20, 2006 15:47 ]
Post subject: 
Try using a different 5VDC source, like from your PC's power supply.
Author:  badchicken [ Mon Nov 20, 2006 19:52 ]
Post subject: 
Thanks for your advice One~Zero, but the contrast remains unchanged :( :(
Author:  One~Zero [ Mon Nov 20, 2006 20:50 ]
Post subject: 
What kind of potentiometer is that? Reason I ask is make sure it's not an audio taper pot, as that will give different results too. Also, make sure all your grounds are connected well (ie., LPT 18-25 and LCD pin 1, plus the power supply ground) should all be tied together. If that doesn't change anything, see if you can try it on another PC.
Author:  kuzgun [ Sat Dec 02, 2006 22:52 ]
Post subject: 
Hi to all.
I dont make a new topic beacuse i have a problems like you :).
I am using a AV Display HK12864K-801 LCD, when i first connection same as 3. picture. LCD correctly run a couple minutes. After all now i dont get any picture to LCD. When i am using LCD studio. When i quit the lcd studio and run again LCD studio exit message and 1/4 of the last screen displayed LCD and make a new screen all information on the LCD disappeared.

Thanks for your helps and sorry for my bad English.
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