Author Topic: NHD-C12864WO-B1TFH#-M Contrast issue  (Read 2120 times)


  • Newbie
  • *
  • Posts: 2
  • Karma: 0
    • View Profile
NHD-C12864WO-B1TFH#-M Contrast issue
« on: March 02, 2018, 10:40:41 PM »

I have upgraded to this display NHD-C12864WO-B1TFH#-M because the one I was using from Newhaven was discontinued.
Its pin comparable except for the contrast section. This LCD needs a voltage divider (with a POT) to set the contrast.

Even with this setup I am having issues with the contrast, its very eratic.

Looking at the spec sheet it says that the Logic voltage should be 3.3V (I have this), now the JST connector that powers
the LED white backlight needs to be 3.4V to 3.6V, I hooked this up to my powersupply and this is fine. However there is
an Item in the spec sheet that says "Supply for LCD (contrast)" Vlcd page 5 of the spec sheet, it says 9.2V to 9.8V and on page
3 of the mechanical diagram it says Voltage 3.0V VDD, 9.5V VLCD. Where is the hookup for VLCD? IM confused that should be 9.5V?

Any help would be appreciated.



  • Administrator
  • Hero Member
  • *****
  • Posts: 384
  • Karma: 10
    • View Profile
Re: NHD-C12864WO-B1TFH#-M Contrast issue
« Reply #1 on: March 05, 2018, 08:02:47 AM »

The VLCD is generated by the booster circuit on the display and is controlled via software (Set Electronic Volume Command)
This voltage doesn't need to be applied, and you should see 9~11 V on pin V0 if your settings are correct and the internal booster is activated.


NHD‐C0220AA‐FSW‐FTW Contrast

Started by mhathawayBoard Character LCDs

Replies: 1
Views: 4444
Last post March 03, 2015, 11:53:43 AM
by Retheesh_M
Adjusting NHD‐C0220BiZ‐FSW‐FBW‐3V3M contrast

Started by OBergeronBoard Character LCDs

Replies: 1
Views: 4719
Last post April 25, 2016, 03:38:21 PM
by Saurabh_B
3 Volt to 3.3 Volt longterm reliability issue

Started by muragavinoBoard OLEDs

Replies: 1
Views: 4807
Last post November 11, 2014, 03:04:04 PM
by Michael_L
NHD‐0216HZ‐FL‐YBW‐C adjusting contrast with manufacturer disabled pin

Started by 8510LeoBoard Character LCDs

Replies: 3
Views: 5327
Last post February 27, 2016, 09:13:09 AM
by 8510Leo
Contrast supply for NHD‐24064WG‐ATFH‐VZ#

Started by Shaun_CarawayBoard Graphic LCDs

Replies: 2
Views: 7508
Last post May 19, 2014, 10:01:31 AM
by Shaun_Caraway