contrast control

[maxdamage]

Hi everybody.

I have a 634 backlit lcd, version 1.3. I have it mounted in a box on my desk and I would like to fit manual controls on the box to alter brightness and contrast.

I plan on using a regulator to control the 5V led supply for brightness contol, but i am unsure on how to control the contrast.
Are there any solder pads on the pcb for an external pot?

Any help would be appreciated. :confused:

[CF Tech]

Hmmm. We went to all that trouble to make it software adjustable, and now you just want hardware!:rolleyes:

Well, the regulator should work for the backlight as you suggest. For the contrast (this will void your warranty) you would need to remove R8, and then connect the wiper of a 10K pot to the rightmost terminal of RT1:

http://www.crystalfontz.com/backlight/force_contrast.jpg

Connect the other terminals of the pot to +5v and Ground.

[maxdamage]

Thanks, that's exactly what i need. :) Your support is just as good as the products. :)

Sorry about the wasted effort, but I won the display in a case modding competition so I could hardly leave it as standard. ;)

Thanks again for your help.